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JURISDICTION : DISTRICT COURT OF WESTERN AUSTRALIA
IN CIVIL
LOCATION : PERTH
CITATION : MOON RECRUITMENT PTY LTD -v- EXECOM SOFTWARE PTY LTD t/as EXECOM PERSONNEL [2025] WADC 18
CORAM : SWEENEY DCJ
HEARD : 8 JUNE 2023
DELIVERED : 3 APRIL 2025
FILE NO/S : APP 66 of 2022
BETWEEN : MOON RECRUITMENT PTY LTD
Appellant
AND
EXECOM SOFTWARE PTY LTD t/as EXECOM PERSONNEL
First Respondent
ADAM HORNE
Second Respondent
ON APPEAL FROM:
Jurisdiction : WORKERS’ COMPENSATION ARBITRATION SERVICE
Coram : ARBITRATOR RUTHERFORD
File Number : A104376
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Catchwords:
Workers’ compensation – True employer case – Alleged error of law by arbitrator – Identity of employer – Misdescription of party
Legislation:
Workers’ Compensation and Injury Management Act 1981 (WA), s 5, s 71
Result:
Leave to appeal refused in APP 66 of 2022 and related APP 65 of 2022
The court will hear from the parties as to the possible amendment of the appellant in both appeals prior to the making of final orders
Representation:
Counsel:
Appellant
:
Mr G R Hancy
First Respondent
:
Mr T Lampropoulos
Second Respondent
:
Mr R D McCabe
Solicitors:
Appellant
:
Hall & Wilcox (Perth)
First Respondent
:
HWL Ebsworth Lawyers (Perth)
Second Respondent
:
Foyle Legal
Case(s) referred to in decision(s):
Agrigrain Pty Ltd v Rindfleish [2024] NSWCA 295
Australian Broadcasting Tribunal v Bond [1990] HCA 33; (1990) 170 CLR 321
Australian Mutual Provident Society v Chaplin; sub nom Australian Mutual Provident Society v Allan (1978) 52 ALJR 407; (1978) 18 ALR 385
BHP Billiton Iron Ore Pty Ltd v Brady [2008] WASCA 250
BP Refinery (Westernport) Pty Ltd v Shire of Hastings (1977) 180 CLR 266
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Brambles Holdings Ltd v Bathurst City Council [2001] NSWCA 61; (2001) 53 NSWLR 153
Brogden v Metropolitan Railway Company (1877) 2 App Cas 666
C & T Grinter Transport Services Pty Ltd (in liq) & Grinter Transport Pty Ltd (in liq); Ex parte Fitzgerald & Adams [2004] FCA 1148
Carey v President of the Industrial Court Queensland [2004] QCA 62
Catholic Education Office of WA v Granitto [2012] WASCA 266
Codelfa Construction Pty Ltd v State Rail Authority of New South Wales (1982) 149 CLR 337
Construction, Forestry, Maritime, Mining and Energy Union v Personnel Contracting Pty Ltd [2022] HCA 1; (2022) 275 CLR 165; (2022) 96 ALJR 89
Damevski v Giudice [2003] FCAFC 252
Empirnall Holdings Pty Ltd v Machon Paull Partners Pty Ltd (1988) 14 NSWLR 523
Erceg v Galati Nominees Pty Ltd [2016] WASCA 112
Esanda Ltd v Burgess [1984] 2 NSWLR 139; [1985] ANZ ConvR 32
Fagan v Minister for Corrective Services [2024] WASCA 167
Golden Plains Fodder Australia Pty Ltd v Millard [2007] SASC 391
Gothard, in the matter of AFG Pty Ltd (Receivers and Managers appointed) (in liq) v Davey [2010] FCA 1163
Hawke v Edwards (1947) 48 SR (NSW) 21
Hollis v Vabu Pty Ltd [2001] HCA 44; (2001) 207 CLR 21
Laidlaw v Hillier Hewitt Elsley Pty Ltd [2009] NSWCA 44
Maggbury Pty Ltd v Hafele Australia Pty Ltd [2001] HCA 70; (2001) 210 CLR 181
Marks v Coles Supermarkets [2021] WASCA 176
Marshall v Whittaker’s Building Supply Company (1963) 109 CLR 210
McCluskey v Karagiozis [2002] FCA 1137; (2002) 120 IR 147
Mushroom Composters Pty Ltd v IS & DE Robertson Pty Ltd [2015] NSWCA 1
Narich Pty Ltd v Commissioner of Pay-roll Tax [1983] 2 NSWLR 597
Nokes v Doncaster Amalgamated Collieries [1940] AC 1014
Nugawela v Medical Board of Australia [2023] WASCA 92
Pacific Industrial Co v Jakovljevic [2008] WASCA 60
Pitcher v Langford (1991) 23 NSWLR 142
R v Foster; Ex parte The Commonwealth Life (Amalgamated) Assurances Ltd (1952) 85 CLR 138
Raftland Pty Ltd as Trustee of the Raftland Trust v Commissioner of Taxation [2008] HCA 21; (2008) 238 CLR 516
Resilient Investment Group Pty Ltd v Barnet and Hodgkinson as liquidators of Spitfire Corporation Ltd (in liq) [2023] NSWCA 118
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RJ Baker Nominees Pty Ltd v Parsons Management Group Pty Ltd [2010] WASCA 128
Rodriguez v Telstra Corporation Ltd [2002] FCA 30
Shaw v Bindaree Beef Pty Ltd [2007] NSWCA 125
Snook v London and West Riding Investments Ltd [1967] 2 QB 786
Soulemezis v Dudley (Holdings) Pty Ltd (1987) 10 NSWLR 247
Stevens v Brodribb Sawmilling Company Pty Ltd (1986) 160 CLR 16
Sweeney v Boylan Nominees Pty Ltd [2006] HCA 19; (2006) 226 CLR 161
Taylor v Johnson [1983] HCA 5; (1983) 151 CLR 422
Toll (FGCT) Pty Ltd v Alphapharm Pty Ltd [2004] HCA 52; (2004) 219 CLR 165
WorkPac Pty Ltd v Rossato [2021] HCA 23; (2021) 271 CLR 456
ZG Operations Australia Pty Ltd v Jamsek [2022] HCA 2
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SWEENEY DCJ
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SWEENEY DCJ:
Introduction
1
Two related appeals, both from the decision of an arbitrator of the Workers’ Compensation Arbitration Service, were heard concurrently in this court. One appeal (APP 66/2022) concerned the arbitrator’s finding that it was ‘Moon Recruitment’ (Moon Recruitment), and not the first respondent Execom Software Pty Ltd (Execom), which had been the employer of the second respondent, Mr Adam Horne, when he was injured at work. At the time of the hearing before the arbitrator, the appellant in this appeal, Moon Recruitment Pty Ltd was identified only as Moon Recruitment. The arbitrator ordered Moon Recruitment to reimburse Execom for the workers’ compensation payments it had already made to Mr Horne.
2
In a related application by Mr Horne, the arbitrator also ordered that Ms Kerrie Moon trading as Moon Recruitment pay weekly workers’ compensation payments to Mr Horne. The other appeal (APP 65/2022) concerned that order.
3
It was uncontroversial that Mr Horne had been injured in the workplace of Echo Marine on 2 September 2019, his first day of work. He had answered an advertisement placed by Moon Recruitment in August 2019 for a three-month position as a fabricator on a boat building project with Echo Marine in the suburb of Henderson, at competitive industry rates.
4
Moon Recruitment had an agreement with Echo Marine to supply workers to it on a labour-hire basis. ‘Labour-hire’ workers are typically employed and paid by the labour-hire business, but work at the ‘host’ project or business, often under the direct supervision of the host, and the labour-hire business typically charges the host business for their workers’ wages, superannuation, workers’ compensation insurance premiums and other expenses, and an additional fee for providing the workers. Under such an arrangement, it was the labour-hire business, rather than the host business, which was obliged by the Workers’ Compensation and Injury Management Act 1981 (WA) (the Act) to arrange workers’ compensation insurance to cover any work-related injury.
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5
Ms Kerrie Moon of Moon Recruitment interviewed Mr Horne and thought him suitable, sent him to Echo Marine for his welding test to demonstrate his skills and told him that he had secured the job subject to a drug and alcohol screen, which she organised for him. She also provided him with a uniform.
6
By prior arrangement between Moon Recruitment and Execom, Mr Horne was then sent a written offer on 30 August 2019 by Execom (the Execom offer) concerning that same job, by which he would agree to provide his services to Execom’s ‘client’ and Execom would agree to pay him, as well as to take out workers’ compensation insurance which covered him. But Echo Marine was not Execom’s client. It had no contractual or other relationship with Echo Marine, the business at which he was to work. Execom did arrange for Mr Horne to be covered by a workers’ compensation policy with its insurer. Mr Horne commenced work at Echo Marine and was promptly injured. Weeks after he had been injured, Mr Horne signed the Execom offer. Execom made a claim on its insurer, which accepted liability to make workers’ compensation payments to Mr Horne and did so.
7
Eventually, however, Execom brought an application against Mr Horne and Moon Recruitment (matter no A104376) pursuant to s 71 of the Act, asserting that Mr Horne had not been lawfully entitled to those payments from Execom. In the event that it was successful, Execom sought an order that Moon Recruitment, which it argued was Mr Horne’s employer, reimburse it for the payments it had made. No order was sought against Mr Horne. Mr Horne brought his own application (matter no A105048) against both Execom and ‘Kerrie Moon t/as Moon Recruitment’, seeking an order for weekly compensation payments and expenses against whichever entity was found to be liable in matter A104376. The matters were consolidated and heard together and the arbitrator published the one decision.
8
It being Execom’s application for reimbursement, the onus lay on it to satisfy the arbitrator, on the balance of probabilities, that it was not Mr Horne’s employer within the meaning of the Act and he had not been lawfully entitled, therefore, to the payments he had received from Execom. It was accepted by all parties during that hearing, as before this court, that Mr Horne was entitled to receive workers’ compensation payments, the issue being which of the two potential employers was liable for those payments. It was accepted that one of the parties was liable as Mr Horne’s employer within the meaning of the Act. The arbitrator was persuaded that Execom was not
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Mr
Horne’s employer and that Moon Recruitment was, and ordered Moon Recruitment to reimburse Execom accordingly. Moon Recruitment appeals that decision by these proceedings: APP 66/2022. That is the substantive issue before this court.
9
For the reasons which appear below, and subject to the description of the party being clarified, in APP 66/2022 the arbitrator’s decision is upheld.
10
In Mr Horne’s related application before the arbitrator, seeking an order for weekly workers’ compensation payments from whichever party was found liable in matter A104376, the arbitrator ordered ‘the first respondent’ in that application to make those payments, the first respondent having been named as ‘Kerrie Moon t/as Moon Recruitment’. By APP 65/2022 Ms Moon appeals that decision on the basis that it was Moon Recruitment Pty Ltd which traded as Moon Recruitment, and not Ms Moon in her personal capacity and that Ms Moon did not enter into any contract of employment with Mr Horne.
11
As mentioned above, the tribunal heading in the application by Execom in matter A104376 described the second respondent as merely ‘Moon Recruitment’, not ‘Moon Recruitment Pty Ltd’. The arbitrator in his reasons for both matters simply referred to ‘Moon Recruitment’, abbreviated to ‘Moon’.
12
The variations ‘Moon Recruitment’, ‘Moon Recruitment Pty Ltd’ and ‘Kerrie Moon trading as Moon Recruitment’ were used interchangeably in the filed documents and documentary evidence before the arbitrator. Amongst the exhibits before the arbitrator, ‘Moon Recruitment’ was the name employed in a 2015 agreement between Moon Recruitment and Execom, but ‘Moon Recruitment Pty Ltd’ was the name employed in a July 2019 agreement between Moon Recruitment and Echo Marine, prior to Mr Horne’s injury occurring.
13
Counsel for both Moon Recruitment and Ms Moon informed this court that Ms Moon had once traded under the business name ‘Moon Recruitment’ but, by the relevant time, Moon Recruitment was an incorporated body and Ms Moon no longer traded in her own capacity. The issue was not raised with the arbitrator.
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14
The two orders made were not, on their face, inconsistent. Had one order referred to Moon Recruitment Pty Ltd while the other related to Ms Moon, there would have been an error on the face of two inconsistent orders but, in fact, neither order identified Moon Recruitment as a corporate body.
15
The arbitrator made no finding in his reasons that Ms Moon was the employer of Mr Horne in her personal capacity. If the issue of the description had been raised by Ms Moon and Moon Recruitment’s lawyers before the arbitrator, an amendment could have been made at that time to the description of the party. The arbitrator had power to set his own practice and procedure: s 188(5) of the Act. He also had the power to correct an error, post decision, to a material mistake in the description of any person: s 216. This court has power on appeal to vary any decision made, or make an additional decision as should have been made in the first instance, as this court thinks fit: s 250. That power encompasses an amendment to the description of the party in the orders made.
16
It was made plain before this court that this argument was not advanced on the part of Ms Moon or Moon Recruitment on appeal in order that Mr Horne would not be able to receive workers’ compensation payments. The court was informed that the insurance company which had funded the appeals would respond to the liability to make payments in the event the substantive appeal failed. In those circumstances and on that basis, neither Mr Horne nor Execom opposed an amendment being made by this court to the description identifying the proper party to make those workers’ compensation payments in the event that the substantive appeal failed. If the appeal in APP 66/2022 succeeded and liability rested once more with Execom, then the point was academic. After those preliminary discussions and on that basis, Mr Horne, who took a neutral stance on the substantive issues, did not wish to take an active role in the hearing and his counsel was given leave to withdraw to await this decision. The matter of the amendment is revisited at the conclusion of this decision.
Nature of appeal to this court
17
The arbitrator provided written reasons for his decision. In such circumstances a party may, with the leave of this court, appeal the decision, but this court is not to grant leave unless ‘a question of law is involved’: s 247(2) of the Act. No leave had been given in advance of the hearing of the appeals.
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18
A ‘question of law is involved’ where either an error of law, or an error of mixed law and fact, is involved. In a plain case, the application for leave may be dealt with before considering the grounds of appeal, but often it may be preferable to consider the question of leave after considering the merits of the grounds, and the court is not bound to accept that an error of law is ‘involved’ merely because it has been asserted: BHP Billiton Iron Ore Pty Ltd v Brady [2008] WASCA 250 [14] – [15] (Pullin JA).
19
No error of law is involved in a wrong or doubtful finding or inference of fact on the evidence, but where findings of fact have been made or inferences drawn without any evidence to support them, an error of law is involved: Erceg v Galati Nominees Pty Ltd [2016] WASCA 112 [31] (Erceg v Galati) and the cases cited therein.
20
An appeal to this court pursuant to s 247 of the Act is by way of a review on the basis of the materials which were before the arbitrator, subject to the giving of leave to adduce fresh or other evidence. The parties did not seek to put any additional evidence before this court.
21
If an error of law is involved, the grant of leave to appeal remains discretionary but, if leave to appeal is granted, then the appeal is to be by way of a real review of the decision. Such a review is not a hearing de novo. The court does not start again from the beginning, as though the original decision under appeal had not been made, in order to arrive at a view afresh. An appellant must provide a proper basis, by way of establishing error, for disturbing the decision of the arbitrator: Pacific Industrial Co v Jakovljevic [2008] WASCA 60 [26] – [27] (Wheeler JA) (Pacific Industrial). That is in addition to the requirement that, in order to obtain leave to appeal, the appeal must involve a matter of law: Catholic Education Office of WA v Granitto [2012] WASCA 266 [56] – [57] (cited with approval in Marks v Coles Supermarkets [2021] WASCA 176 [116]). Simply arguing that this court should reach a different decision on the evidence and substitute that decision for that of the arbitrator is not a proper basis for a review: Pacific Industrial [26] – [27] (Wheeler JA).
22
The appeal in Pacific Industrial concerned the interpretation of the previous version of s 247, which was in similar terms to the section pursuant to which these appeals were filed, except that an appeal lay to the since-abolished office of the Commissioner. The Commissioner had observed that a finding of fact based on the arbitrator’s evaluation
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of the evidence was not correctable on appeal. On appeal from the
Commissioner’s decision, Wheeler JA, with whom the rest of the court agreed, drew the distinction between the requirement that a question of law be involved as a condition precedent to the granting of leave to appeal, and the task to be undertaken in the review of the arbitrator’s decision. If an error of law is involved, then the jurisdiction to review is enlivened and the court is not restricted to correcting errors of law. Pacific Industrial was affirmed as correct and of continued application in the Court of Appeal decision of Marks v Coles Supermarkets [5], [124]. In the judgment, the court held that [124]:
It is not sufficient to satisfy the District Court judge that a decision other than that made by the arbitrator is correct and preferable. Some material error of fact or law, or some other miscarriage of justice, must be established.
23
The court also made observations [126] about the need for this court to bear in mind the natural limitations of an appellate court and the advantage which the original fact-finder enjoys in having seen and heard the witnesses testify first-hand. A distinction was drawn, however, between findings of primary and secondary facts based on an assessment of that evidence, which are likely to have been affected by decisions made about credibility of the witnesses, and inferences to be drawn from those findings of fact, as to which the appellate court is in as good a position as the original fact-finder: [126] – [130]. If an error or a miscarriage of justice is established on appeal then, where this court is able to substitute its own decision, it should do so, otherwise it may be necessary to remit the matter for redetermination: Marks v Coles Supermarkets [131].
Grounds of appeal in APP 66/2022 against the finding that Execom was not liable to pay workers’ compensation
24
There are two grounds of appeal: firstly, that the arbitrator erred in law in holding that no contract existed between Execom and Mr Horne at the time he was injured on 2 September 2019 in that, prior to that date, Execom had made a written offer to engage Mr Horne which set out his terms of engagement and pay, which offer was accepted by Mr Horne by his conduct, and later accepted in writing. The second ground asserts that the arbitrator erred in law in finding that there was any contract of employment between Moon Recruitment and Mr Horne. It asserts that no offer setting out the terms of engagement and his pay was ever made to Mr Horne by Moon Recruitment.
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25
The grounds were expressed in language consistent with the written and oral submissions for Moon Recruitment: namely that it was not necessary for the arbitrator to find that the offer made by Execom was a contract of employment as such, because it was a contract by which Mr Horne fell within the definition of ‘worker’ under the Act in any event. As will be seen when the statutory provisions are set out below, there are several definitions of ‘worker’ within the Act, and a person who enters into a contract of employment, or engages a ‘worker’, is thereby an ’employer’. The contest between the parties was not about whether or not Mr Horne came within the definition of ‘worker’ within the Act. It was accepted that he was a ‘worker’ and that sufficed to render one of the parties his employer. The contest was as to which of the two entities had become his ’employer’ within the meaning of the Act. It was not critical to Moon Recruitment’s argument, therefore, that the precise pathway be arrived at. It argued, however, that it was Execom which had entered into the contract with Mr Horne by which he became a ‘worker’.
26
It is convenient then in this judgment to refer to the issue as being related to which of the two was his ’employer’ and to his contract of ’employment’, without the constant need to qualify what is encompassed in that word by reference to the Act, and so I intend to do so.
27
In the notice of appeal, the question of law said to be involved was whether a contract was made between Execom and Mr Horne, and whether a contract of employment or any contract was made between Moon Recruitment and Mr Horne. Expressed in that broad fashion, it was not possible from the grounds to determine whether the ‘question of law’ was merely an attempt to re-agitate the factual disputes before the arbitrator in the hope of a more favourable outcome. On that basis, Execom argued that there was no question of law involved.
28
In Moon Recruitment’s written submissions, the question of law was said to be

 whether the facts as found were sufficient to support the conclusion that a contract was made between Horne and (Moon Recruitment) and was one of employment 

which was equally opaque. But there were layers to that question, developed in submissions.
29
The written and oral submissions asserted that the arbitrator had adopted a flawed approach and taken into account legally irrelevant matters, contrary to the approach dictated by the High Court
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in
the decision of Construction, Forestry, Maritime, Mining and Energy Union v Personnel Contracting Pty Ltd [2022] HCA 1; (2022) 275 CLR 165; (2022) 96 ALJR 89 (CFMMEU v Personnel). If the arbitrator had taken into account irrelevant matters, that would amount to an error of law.
30
Expanding on that argument, Moon Recruitment then contended that there were insufficient legally relevant factual findings from which to find that Moon Recruitment had entered into a contract of employment with Mr Horne. If there was no evidence to support the findings made, that too would amount to an error of law. Alternatively, if the alleged error of law was demonstrated in the taking into account of irrelevant matters, then the jurisdiction to review the decision was enlivened, and the court was not restricted to correcting only errors of law, but could correct an error where there was no, or no sufficient evidentiary basis for the finding that Moon Recruitment had entered into a contract of employment with Mr Horne. It being apparent from the above that there were questions of law to be considered and decided in these reasons, then the question of leave is best determined after consideration of the merits of the appeal itself.
31
Complaint was also made in oral submissions as to the adequacy of the reasons given for the rulings. There was no ground of appeal alleging an inadequacy of reasons, and those submissions were advanced rather in support of the submission that the arbitrator made insufficient findings of fact to justify his conclusion.
32
The substance of the second appeal (APP 65/2022) was that the arbitrator erred in law in making the order against Ms Moon personally, rather than Moon Recruitment Pty Ltd. There was also complaint that the arbitrator erred in law in holding that there was a contract of employment made between Mr Horne and Ms Moon trading as Moon Recruitment. In reality, the arbitrator did not make that express finding, but that was the effect of the order made. That issue can be left to one side in the substance of these decisions and revisited at the end.
Statutory provisions
33
Before detailing the parties’ submissions, it is relevant to briefly set out the statutory framework, because the question to be determined by the arbitrator had a context, namely the attribution of liability to make workers’ compensation payments to an injured worker.
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34
Pursuant to s 18(1) of the Act, if a ‘worker’ is injured, ‘the employer’ shall, subject to the Act, be liable to pay compensation in accordance with sch 1, which includes the payment of weekly payments for a worker who has been partially or totally incapacitated for work.
35
By s 160(1), every ’employer’ is obliged to obtain and keep current an insurance policy from an approved insurer for the full amount of the employer’s liability to pay compensation under the Act. Once requested, an approved insurance office is to provide that cover: s 160(3). The Act imposes obligations on both employers and insurers, failure to comply being an offence.
36
Section 5 relevantly defines ‘worker’:
worker does not include a person whose employment is of a casual nature and is not for the purpose of the employer’s trade or business 
 but save as aforesaid, means any person who has entered into or works under a contract of service or apprenticeship with an employer, whether by way of manual labour, clerical work, or otherwise and whether the contract is expressed or implied, is oral or in writing.

..
the term worker save as aforesaid, also includes –
(a) any person to whose service any industrial award or industrial agreement applies; and
(b) any person engaged by another person to work for the purpose of the other person’s trade or business under a contract with him for service, the remuneration by whatever means of the person so working being in substance for his personal manual labour or services 

37
It was accepted by the parties that Mr Horne fell within the definition of a ‘worker’. Section 5 also defines ’employer’:
employer includes any body of persons, corporate or unincorporate, 
 and, where the services of a worker are temporarily lent or let on hire to another person by the person with whom the worker has entered into a contract of employment the latter shall, for the purposes of this Act, be deemed to continue to be the employer of the worker whilst he is working for that other person;
the term employer shall extend to any person for or by whom any worker, as defined in paragraph (a) or (b) of the definition of worker, works or is engaged;
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38
It was accepted by the parties that one or other of Execom or Moon Recruitment was the ’employer’ of Mr Horne and liable to make the workers’ compensation payments. It was not suggested that both could be liable. The parties accepted it was one or the other.
39
The application before the arbitrator was brought by Execom pursuant to s 71(1) of the Act, which relevantly provides:
Where WorkCover WA, the employer, or the insurer has paid compensation 
 to a worker 
 and that person was not lawfully entitled to that payment 
 WorkCover WA, the employer, or the insurer, as the case may be, may apply for an order of an arbitrator that compensation or expenses so paid be refunded, and an arbitrator has jurisdiction to hear and determine such an application and 
 to make any order in relation thereto 
 as the arbitrator considers appropriate in the circumstances.
40
Section 71(2) provides:
Without limiting the orders that may be made under subsection (1), the arbitrator may, instead of making an order for a refund, order any person who the arbitrator determines was liable for the 
 compensation 
 to reimburse the person who paid the compensation 

41
Having found that Moon Recruitment was the employer, s 71(2) was the basis for the order that Moon Recruitment was to reimburse Execom for the workers’ compensation payments it had made to Mr Horne.
42
An argument was but faintly floated that an application pursuant to s 71 pre-supposes that Execom was the employer, or it had no standing to make such an application. That argument was rejected by the arbitrator. It seems a hollow point, as the insurer behind Execom’s payments could have made the application. There is no ground of appeal related to the arbitrator’s conclusion on this point and no application was made to add such a ground. That is sufficient to deal with that point.
Factual findings made by the arbitrator which underpinned his reasons for decision
43
Three witnesses testified before the arbitrator, Ms Moon of Moon Recruitment, Ms Woodman of Execom and Mr Horne. An agreed book of documents was also put before him.
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44
Early in his decision, the arbitrator summarised a number of factual matters under the heading of ‘Background information and issues in dispute’, the background information contained in [5] – [15] amounting to factual findings. Clearly, he considered these facts to be established and/or uncontroversial. The arbitrator found:

  1. Regard is to be had to the totality of the circumstances surrounding the relationship of the parties.
  2. The circumstances may include the factors considered in determining whether a given relationship is an employment relationship at all.
  3. Events which occurred after the relevant contract was formed may also be considered.
  4. It is the reality of the contractual arrangements which is to be considered. Effect may be given to that underlying reality despite the absence of any submission that certain arrangements are a sham.
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  5. Payment of wages and issuing a taxation group certificate by one entity is important but not conclusive as to the identity of the employer. It may reflect no more than financial convenience between entities within one corporate group. Nevertheless, such factors will in most cases require active consideration.
  6. Documents created by one or more of the entities describing or evidencing their relationship will be relevant, but not necessarily conclusive as to the true character of the relationship. The Court should consider the purpose for the creation of the documents. For example, certain documents may have been prepared for a purpose other than describing the contractual relationship, such as taxation minimisation or reduction of insurance premiums.
  7. Conversations and conduct at the time of the engagement of the worker are of considerable significance. The belief of the worker as to the identity of the employer is admissible and should be given due weight.
  8. When new employees are engaged to work in a business in which a number of separate corporate entities participate other than as partners, it is open to those controlling the business to select the company which is to be the employer. However, that selection must be consistent with the financial and administrative organisation of the business and not otherwise be a sham.
    180
    To that summary of principle, I add Finn J’s additional observation from Grinter Transport [20], that a contract of service cannot be transferred by one employer to another, or novated as between them, without the employee’s real express or implied consent: see also Nokes v Doncaster Amalgamated Collieries [1940] AC 1014; McCluskey v Karagiozis [2002] FCA 1137; (2002) 120 IR 147 [11] – [12]. That principle informs the willingness of courts in such cases to give consideration to the employee’s knowledge and belief as to which entity employed him. In several of the cases, however, the worker neither knew nor cared particularly which entity within a group of companies had employed him, it being of practical importance only once litigation commenced.
    181
    White J found that the trial judge necessarily determined the question of which entity had employed the worker by reference to the totality of the documentation generated within the overall business – which was not restricted to just the few documents pertaining to the worker specifically – given that the trial judge found that the worker was indifferent as to which entity had employed him at the farm,
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    and
    that the evidence of the witnesses called to testify for Golden Plains was unreliable. White J considered the effect of the financial arrangements between Macpri and Golden Plains – to which the worker would not have been privy – including the payment by Golden Plains to Macpri of sums covering its payment of wages, superannuation and workers’ compensation premiums by way of a simple transfer of the same sums, and the de-registration of Golden Plains as an employer with Workcover at the relevant time, replaced by Macpri, and found that the documentary evidence pointed almost entirely one way in favour of the conclusion that Macpri was the employer. His Honour rejected the idea that the arrangement was a sham, observing [91] that it is not uncommon within a corporate group for one entity to own the assets and another to employ the workers, whether for taxation benefit or to protect the assets from liability from claims for unpaid entitlements, and such arrangements are often quite transparent and achieve precisely what is sought to be achieved.
    182
    Similar in approach to Pitcher v Langford, the judgments in the case support a broad consideration, in a case where the issue is the identity of the employer, of the totality of the evidence including the financial and structuring arrangements between the two competing potential employers and the intention of the two potential entities contending for (or contending to avoid) the role of employer, without the limitation that those facts must be known to the employee, who knew little or nothing of those matters.
    183
    In the Federal Court decision in Gothard, in the matter of AFG Pty Ltd (Receivers and Managers appointed) (in liq) v Davey [2010] FCA 1163 [52] Edmonds J referred to the true employer cases broadly as follows:
    Unsurprisingly, the outcome in cases which have been concerned with identifying an employer of a person or group of persons from two or more possibilities, whether from within the same group of companies or otherwise, has turned on their own facts and, in consequence, the case law in this area is of limited assistance. Nevertheless, it is possible to discern certain general principles that the courts have applied in the identification process. The courts have adopted the position that in undertaking this exercise, they are entitled to take a wide view of the putative relationship, beyond the terms of the contractual documentation, to examine how the parties conducted themselves in practice and whether, where there is contractual documentation, the reality of the situation accords with the terms of that documentation or whether it points to another entity being the employer.
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    184
    His Honour continued [60]:
    Aspects of the practical realities of the relationship which have been considered relevant in the cases referred to above, include a consideration of the entity which:
    (a) had practical and legal control and direction of the employees;
    (b) made decisions about hiring;
    (c) made decisions about disciplinary issues;
    (d) made decisions about the level of remuneration;
    (e) actually paid remuneration;
    (f) communicated with employees about leave;
    (g) made decisions about termination of employment.
    185
    The decisions referred to above all pre-dated the High Court decisions in CFMMEU v Personnel and ZG Operations.
    186
    In the post-CFMMEU v Personnel landscape, the decision of Resilient Investment Group Pty Ltd v Barnet and Hodgkinson as liquidators of Spitfire Corporation Ltd (in liq) [2023] NSWCA 118 (Resilient) concerned an application by a liquidator for directions from the court as to how to distribute $2 million in tax offset refunds received on behalf of Spitfire Corporation Ltd (in liquidation) for expenditure on research and development (R&D refunds). Resilient Investment Group was a creditor of Spitfire and held a circulating security interest (what used to be called a ‘floating charge’) over its assets. It was common ground that, if the R&D refunds were circulating assets of Spitfire as at the date of appointment of the liquidator, then those sums had to be applied to first satisfy any outstanding employee entitlements before Resilient’s claim. The trial judge found that the R&D refunds were circulating assets of Spitfire, which finding was overturned an appeal. That determined the appeal outcome.
    187
    Relevant to this matter, though, was another ground of appeal which turned on whether certain employees of the Spitfire group of companies were in fact employed by Spitfire, or one of its subsidiaries, Aspirio Pty Ltd, which was named in each employment contract as the employer. The trial judge considered the totality of the relationship, following Pitcher v Langford and Shaw v Bindaree, and distinguishing
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    CFMMEU v Personnel
    , ZG Operations and a third High Court decision of WorkPac Pty Ltd v Rossato [2021] HCA 23; (2021) 271 CLR 456 (WorkPac v Rossato), and found that the workers were employed by Spitfire. Gleeson JA, with whom White and Brereton JJA agreed on this issue, upheld the trial judge on that finding.
    188
    Certain facts were agreed, or not disputed, on appeal. Spitfire was the parent company and sole shareholder for seven wholly owned subsidiaries, including Aspirio. The Spitfire group employed 42 employees, and the employees in question had written employment agreements with Aspirio, although there were various references to ‘the Group’ in those contracts and the employees performed tasks amongst the companies. There was evidence that each business entity in the group conducted different and separate business activities, and the employees were required to follow directions from their individual managers amongst the group.
    189
    There was also evidence that having Aspirio employ most of the employees in the group meant greater administrative efficiencies in matters of human resources, payroll and payment of taxes. The contracts provided for the payment of wages, superannuation and other entitlements by Aspirio, which was also identified as the payer on the employees’ payslips. It lodged and ostensibly paid the workers’ compensation premiums, reported PAYG for the employees through the business activity statements lodged with the Australian Taxation Office, and logged leave entitlements of the employees. But, while Aspirio had a couple of bank accounts, it held no assets, conducted no business separate to the group, had no customers, generated no revenue and operated at a loss every year.
    190
    Spitfire in fact paid the wages out of its own bank account to the employees and/or their superannuation funds, paid the insurance premiums to the workers’ compensation insurers and forwarded withholding tax, and then those sums were added to a loan balance owed by Aspirio to Spitfire. Aspirio did not ever charge Spitfire a management fee or any other amount in connection with being the employer entity. Ultimately, prior to going into administration and then liquidation, Spitfire entered into a deed by which it forgave the loan balance owed by Aspirio. The recitals of the deed (Resilient [19]) recorded that the parties often operated as a single entity and
    as such, loan balances may exist between the parties from time to time as they each enter into commercial arrangements as stand-alone counterparties on behalf of the parties.
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    191
    The trial judge found that the employment contracts were consistent with the employees being retained for the benefit of the Spitfire group generally, rather than Aspirio alone and concluded that, in so far as Aspirio was the employer, it was in substance an agent for Spitfire as an undisclosed principal. The trial judge found that Spitfire was the true employer at least for the purposes of the Corporations Act 2001 (Cth) (by which the employee entitlements received priority over secured creditors).
    192
    On appeal, Resilient argued that the decisions of Pitcher v Langford and Shaw v Bindaree, on which the trial judge had relied, were inconsistent with, or had been overruled by, the High Court in CFMMEU v Personnel, ZG Operations and WorkPac v Rossato. The Commonwealth (which had a right of subrogation to the employees’ entitlements) countered that the trial judge’s finding that Spitfire was the employer could be upheld on two bases: first, that the suggested inconsistency with the three High Court decisions was not relevant in any event, because the identity of the employer was determined by reference to principles of agency and, second, that the ‘true employer’ cases dealt with a different issue to the High Court cases. The Court of Appeal accepted both propositions.
    193
    The issue of the identity of the employer is dealt with at [153] – [185] in the decision. As to the ‘true employer’ cases, Gleeson JA observed:
    161 The Commonwealth also says that the so-called ‘true employer’ cases deal with a different topic to that in the High Court cases, being the identity of the party by whom a putative employee is engaged. That should be accepted. The ‘true employer’ cases are not limited to the statutory context of Pitcher v Langford and Bindaree Beef, but include contracts of employment more generally: see, for example, Golden Plains Fodder Australia Pty Ltd v Millard (2007) 99 SASR 461; [2007] SASC 391 at [33]; Sturesteps v McGrath [2010] NSWSC 169 at [14]-[19]; Re DH International Pty Ltd (in liq) [2017] NSWSC 870; (2017) 121 ACSR 585 at [79]; Gothard at [52]-[64]; Re Branded Media Holdings Pty Limited (in liquidation) [2020] NSWSC 557 at [31].
    162 If it was necessary to decide this question, I would agree that his Honour was correct in distinguishing the three High Court decisions (at J[74]) on the basis that there is a real distinction between the High Court decisions and the ‘true employer’ cases. The former are concerned with ascertaining the ‘character’ or
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    ‘characterisation’ of the parties’ relationship (Rossato at [62], [63]; Personnel Contracting at [59], [174]; ZG Operations at [8]) and dealt with whether an employee was engaged on a casual or permanent basis (Rossato), or whether a worker was an employee or an independent contractor (Personnel Contracting and ZG Operations). By contrast, the ‘true employer’ cases are concerned with ascertaining the identity of the party by whom a putative employee is engaged: see, for example, Gothard v Davey at [52]; Bindaree Beef at [59].
    163 Nor should it be accepted, as Resilient submits, that Pitcher v Langford and Bindaree Beef were expressly or impliedly overruled (by) the three High Court cases. Those cases were not considered by the three High Court cases. Insofar as Pitcher v Langford was cited in a footnote by Gageler and Gleeson JJ in Personnel Contracting at [135], fn 218, that does not assist Resilient’s argument. Read in context, the footnote does not cast doubt on Pitcher v Langford. Nor were Pitcher v Langford and Bindaree Beef impliedly overruled by the High Court cases. As indicated, the ‘true employer’ cases concerning the identity of the employer were not in issue in Personnel Contracting, Rossato or ZG Operations.
    164 It is not to the point, as Resilient submits, that because the judgments of Priestley JA (at 154-155) and Handley JA (at 160-161) in Pitcher v Langford referred to R v Foster; Ex parte Commonwealth Life (Amalgamated Assurances) Ltd (1952) 85 CLR 138 at 151 and 155; [1952] HCA 10, and the High Court said in Personnel Contracting that the relevant passages in Foster are concerned with variation of contract and do not support a court departing from the terms of the written contract in construing the relationship between the parties (at [49]-[52], [179]), that this is to be taken as impliedly overruling the reasoning in Pitcher v Langford. The reasoning in Pitcher v Langford was not limited to the citation of passages from Foster alone. Priestley JA, in dissent, found at 154-155 that the conduct of the parties was not pursuant to their written agreement, ‘but upon the basis of the arrangements in force upon earlier shearings’, being a reference to the nature of the worker’s employment as a shearer. That analysis was consistent with an estoppel; it seems his Honour had in mind a conventional estoppel. Handley JA spoke at 160-162 of whether the parties had ignored or abandoned their written contract. Neither the principles of estoppel nor abandonment of contract were in issue in the three High Court cases.
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    165 The contention that his Honour erred in considering the ‘substance and totality of the relationship’ when determining who was the employer of the relevant employees should be rejected.
    No inconsistency and incoherence in the law
    166 One further matter should be mentioned. It is said that the approach contended for by the Commonwealth leads to inconsistency and incoherence in the law. The spectre of incoherence is misplaced. There is no inconsistency between the application of orthodox contractual principles in determining the character of the parties’ relationship the subject of a written agreement and the application of the principles of agency to determine the parties to a contract.
    194
    The discussion in that decision as to the true employer cases was, strictly, obiter dictum, although it was addressed in detail and involved a point of significance.
    195
    The decision in Resilient, however, was considered in a further decision of the Court of Appeal in Agrigrain Pty Ltd v Rindfleish [2024] NSWCA 295 (Agrigrain v Rindfleish). Again, the case involved the identity of the worker’s employer. Mr Rindfleish had suffered severe physical injuries working at a grain handling facility at Coonamble, and the issue was whether his employer at that time was Agrigrain Coonamble Pty Ltd or the parent company, Agrigrain Pty Ltd. The case was one in which there was no written employment contract, although it was common ground that there must have been an employment contract between the worker and one of the named entities.
    196
    Rindfleish contended that his employer was Agrigrain Coonamble, but sued Agrigrain as the entity responsible for maintenance of the facility and safety onsite. Agrigrain contended that it was his employer which, if true, placed statutory hurdles in his way. Agrigrain was unsuccessful on the point. On appeal, Agrigrain contended that the trial judge had erred in failing to have regard to the totality of the relationship between the parties (relying upon Stevens v Brodribb), in giving insufficient significance to the degree of control that Agrigrain exercised over the worker’s work activities, and in attributing excessive weight to the fact that Agrigrain Coonamble had been the entity that paid his wages.
    197
    Kirk JA, with whom Ward P and Stern JA agreed, referred to CFMMEU v Personnel and the evolution of the principles previously developed to distinguish between an employee and an independent
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    contractor, indicating that, at least for written contracts, the issue was to
    be determined by reference to the terms of the contract. Kirk JA observed, however, [31] that ‘those principles are not directly applicable to the issue here of identity of Mr Rindfleish’s employer’. His Honour found that, where the issue was simply which of the two entities was the party to the employment contract, that was an issue of formation going to the terms of the contract.
    198
    Kirk JA observed that there was no allegation before the court that the contract was a sham, or that the party named as employer was contracting as agent for an undisclosed principal such as arose in Resilient, or that one employment contract had been overtaken in practice by another such as arose in Pitcher v Langford and, therefore, ‘the contractual question here is what a reasonable person in the position of the parties would understand as to the terms and effect of the contract’ [34], referring to Toll v Alphapharm and noting that that principle ‘extends to identifying the parties to the contract’, citing Shaw v Bindaree [61] – [62].
    199
    His Honour continued [34]:
    
 Where there are two potential employers, in a case such as this one, the ‘parties’ here can be taken to include both of them such that the question is what a reasonable person in the position of all potentially relevant parties would understand as to which entity was party to the employment contract as employer. For a written contract, assessment of what a reasonable person would understand ‘requires consideration not only of the text, but also of the surrounding circumstances known to the parties, and the purpose and object of the transaction’: Toll at [40]. For contracts not exclusively in writing, post-contractual material may also be relevant in determining what were the terms of the contract eg Lawrence v Ciantar [2020] NSWCA 89 at [114], and authority there cited; Personnel Contracting at [177] and [190].
    200
    Kirk JA referred to the decision of Resilient and the distinction that the court there accepted between the High Court decisions in CFMMEU v Personnel, ZG Operations and WorkPac v Rossato and the ‘true employer’ cases, observing [35] that that discussion in Resilient was obiter. His Honour continued:
    35 
 It is said in The Modern Contract of Employment that the suggestion of such a distinction, and reference to authority preceding the trio of recent cases, ‘is likely to be controversial’ (at [2.020]). There need be no such controversy, nor tension with the High Court decisions, if the statements in Resilient are understood to be addressing the issue of identifying the relevant
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    party to the contract as a matter of contract law. That is how the issue was addressed in this Court’s earlier majority decision in Shaw, which was referred to approvingly in Resilient. As explained, as a matter of contract law regard may be had to surrounding circumstances and, in cases of a contract not wholly written, also to post-contract evidence.
    36 Consistently with the distinction identified in Resilient, the issue of characterising a contractual relationship as one of employment or independent contracting (the characterisation issue) is different from the issue of identifying who are the parties to a contract which it is accepted establishes a relationship of employment (the ‘true employer’ issue). That being said, insofar as post-contract conduct is relevant to the true employer issue it is necessary to identify what sort of conduct might throw light on which entity was the true employer. Notions from the characterisation context may assist in that regard. For example, the nature and degree of control exercised may be relevant to determining whether a person is an employee or contractor 
 Analogously, identifying who exercises control may be relevant to identifying the true employer. Insofar as account is taken in the true employer context of factors identified in the characterisation context, they should be factors which are still relevant in that context in light of the recent trio of High Court decisions.
    201
    His Honour observed that, even in CFMMEU v Personnel [61] the plurality still accepted that the court could consider the totality of the relationship between the parties in determining the character of the relationship, but on the basis that the analysis was concerned with the rights and duties established by the contract, rather than an investigation of how the relationship between the parties had played out in practice. Kirk JA observed [37] that the expression ‘the totality of the relationship’ is not to be regarded as the legal test in itself, because the issue is one of contract law and, if there is a written employment contract which is not alleged to be a sham or otherwise invalid, or overtaken by some subsequent contract or made on the basis of agency for an undisclosed principal, or such like, then the written contract would supply the answer to the question of the identity of the true employer while, if a contract was not wholly written, then it was permissible to refer to post-contractual conduct, but always with an eye to the ‘ultimate question’ being the contractual question [40]:
    of what a reasonable person in the position of all the potentially relevant parties would understand as to which entity was party to the employment contract as employer, taking account of the permissible evidence.
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    202
    While the discussion of those concepts was obiter in Resilient, it was part of the ratio decidendi in Agrigrain v Rindfleish. While that decision is not binding upon this court, it is persuasive authority as to how this court should approach a ‘true employer’ issue.
    203
    In particular, where the issue is the identity of the employer and, as here, there are two (or more) contenders, the court is not restricted to a consideration of the terms of any written contract there may be in existence, or to the dealings between the two parties named in the contract alone, or to the facts known to both parties as the lowest common denominator, but may consider the background information known to all of the parties where that is necessary to throw light on the purpose and meaning of any contract entered into.
    204
    Phrases like ‘the totality of the relationship’ are not the contractual test itself, and are not to replace the ultimate question of the formation of any contract of employment and the identity of the employer. Where the parties have chosen to commit their relationship to a comprehensive written contract, that may well supply the answer to the question, but where there is ambiguity, suggestions of a sham or, if not a sham, an arrangement which does not reflect the intention of the parties in their performance of the contract (whether because the contract was varied, or replaced, or abandoned), where issues of estoppel or agency are present, or other issues which justify a broader approach to identify the employer, then the court is justified in looking to facts outside the confines of the four corners of any contract. The court in CFMMEU v Personnel did not confine the consideration of the court to the four corners of the contract, and allowed for a broader enquiry where appropriate.
    205
    Applying the principles in CFMMEU v Personnel, which allowed for consideration of the factual matrix in which a contract was entered into to assist in determining its object and purpose, and a broader enquiry where there were issues of variation or abandonment of the contract, or estoppel or agency was raised, or sham was raised, or other factors justifying that broader enquiry, there were factors raised in this appeal which positively required a broader enquiry to be made. Further, this case was distinguishable on the basis of the issue to be determined by the court: namely, which of two putative employers was the employer, given that it was not in issue that one of the parties was.
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    206
    To some extent though, the whole discussion of CFMMEU v Personnel and the ‘true employer’ cases begs the substantive question of whether the parties to the alleged employment contract, namely Mr Horne and Execom, did commit their relationship to a comprehensive written contract by the time Mr Horne was injured on his first day of work, or not. Ultimately, Mr Horne did sign the Execom offer, weeks after his injury. Ironically, since Moon Recruitment was the party arguing for a restrictive view of what material was relevant before the arbitrator, that allegedly post-contract conduct is a piece of evidence in favour of identifying Execom as the employer, although there are other arguable interpretations to be placed on it.
    207
    But Execom’s premise that there was a comprehensive written contract in place and therefore the reasoning in CFMMEU v Personnel carries the day does rely upon a finding that Mr Horne had accepted that written offer from Execom by conduct. The arbitrator declined to make that finding. And so now I turn to the principles in relation to acceptance of an offer by conduct.
    Acceptance of an offer by conduct – legal principles
    208
    Moon Recruitment contends that the Execom offer to Mr Horne was accepted by his conduct in attending the premises of Echo Marine for his first day of work.
    209
    In determining whether a binding contract has been concluded, the law is concerned not with the subjective intentions of the parties, but with the outward manifestations of these intentions: Mushroom Composters Pty Ltd v IS & DE Robertson Pty Ltd [2015] NSWCA 1 [59] (Mushroom Composters) citing Taylor v Johnson [1983] HCA 5; (1983) 151 CLR 422, 428 (Mason ACJ, Murphy & Deane JJ). The court is looking to ‘what each party by words and conduct would have led a reasonable person in the position of the other party to believe’: Toll v Alphapharm [40].
    210
    A contract may be inferred from the conduct of the parties: Brogden v Metropolitan Railway Company (1877) 2 App Cas 666 (Brogden). Mr Brogden was a member of a partnership which owned a colliery in Wales and had supplied coal to the Metropolitan Railway Company for years at varying rates, and eventually suggested the parties should enter into a contract. The company drew one up which specified a variable price for the coal and forwarded it to Brogden. He filled in certain blank spaces, nominated an arbitrator in case of
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    dispute, noted ‘approved’ on the document, signed his own name and
    sent it back, where it was placed in a drawer. It was never formally executed by the company or the partnership, but the parties conducted themselves thereafter in accordance with its terms and, when supply faltered, the ‘contract’ was mentioned in correspondence. Ultimately, Brogden refused to supply the coal on those terms and denied that there was a binding contract. The company was successful in its suit.
    211
    On appeal, the Lord Chancellor (Lord Cairns) observed (672):
    
 there is no principle of law better established than this, that even though parties may intend to have their agreement expressed in the most solemn and complete form that conveyancers and solicitors are able to prepare, still there may be a consensus between the parties far short of a complete mode of expressing it, and that consensus may be discovered from letters or from other documents of an imperfect and incomplete description; I mean imperfect and incomplete as regards form.
    212
    The Lord Chancellor found the proposition implausible that, when the parties had clearly been seriously intent on reaching an agreement and had reduced their efforts to writing, it had then suddenly passed ‘entirely out of view, an incomplete and unfinished transaction’: (676). His Lordship referred to conduct following the annotation of the document and said of the conduct (679) that ‘they were supplying coals under a contract, and no contract can be suggested except the contract to which I have already referred’, and (680)
    subject only to approbation, on the part of the company, of the additional term which he had introduced with regard to an arbitrator, that approbation was clearly given when the company commenced a course of dealing which is referable in my mind only to the contract and when that course of dealing was accepted and acted upon by Messrs Brogden & Co in the supply of coals.
    213
    Lord Hatherley found (686) that the conduct of the company in the case amounted to a
    course of action 
 of such a character as necessarily to lead to the inference on the part of the Defendants that the agreement had been accepted on the part of the Plaintiffs and was to be acted upon by them; and they did act upon it accordingly.
    214
    Lord Selbourne observed (688):
    I by no means say that if nothing had been done upon the footing of the agreement, silence would have given consent in such a sense as to bind the parties on either side.
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    215
    His Lordship found (688) that ‘mere mental consent 
 and followed up neither by communication nor by action’ did not suffice to establish a contract but that, in the scenario before the court ‘which entirely rests upon fact’ (690), ‘every single circumstance points quite unequivocally to this agreement’ (689).
    216
    In Brambles Holdings Ltd v Bathurst City Council [2001] NSWCA 61; (2001) 53 NSWLR 153 (Brambles v Bathurst CC), Ipp AJA, with whom Mason P agreed, referred to Brogden and Lord Hatherley’s reasons above, before observing [162] that
    
 for conduct to amount to implied acceptance of an offer, it must be ‘of such a character as necessarily to lead to the inference on the part of the defendants that the agreement had been accepted on the part of the plaintiffs, and was to be acted upon by them’.
    217
    In Laidlaw v Hillier Hewitt Elsley Pty Ltd [2009] NSWCA 44 [5], Macfarlan JA, with whom Beazley JA agreed, drew from the observations reproduced above from Brambles v Bathurst CC [162] and similar observations of McHugh JA in Empirnall Holdings Pty Ltd v Machon Paull Partners Pty Ltd (1988) 14 NSWLR 523, 535 (Empirnall v Machon Paull), the principle that, before a court will infer that a contract was concluded between the parties, the conduct must indicate unambiguously that the parties intended to contract and, ‘it must point to the existence of the contract in the terms alleged in the proceedings’: [9]. It is unnecessary to detail the facts of that case, but Macfarlan JA did not regard an inference drawn by the trial judge in that case as the ‘only’ possibility, and considered that a different sensible explanation ‘was not excluded by the evidence’.
    218
    An offer of employment may be accepted by conduct. In Carey v President of the Industrial Court Queensland [2004] QCA 62 (Carey) a solicitor in the Crown Law Office worked for a period of nine years on the strength of a series of periodical letters announcing and then extending his engagement to work as a legal officer. In legal proceedings it was argued that the letters were mere ‘unilateral announcements’, to which the solicitor had never assented and never been asked to assent. The Court of Appeal (McPherson and Davies JJA and MacKenzie J) found [7] that there was no doubt under the general law that the solicitor’s conduct in continuing to work at the Department, coupled with the continued payment to him of his wages, would have given rise to the inference that a contract of employment had come into
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    existence between them, the terms of which were supplied partly by the
    letters and partly by the common law. The court accepted [9] that, when the solicitor received the final letter extending his work
    his conduct in continuing without dissent to work for the respondent was susceptible of no reasonable inference or interpretation other than that he was agreeing to its terms 

    219
    The court further found [9] that a conclusion to that effect was one of fact, citing McHugh JA in Empirnall v Machon Paull (535), but also observed that the inference to that effect was so compelling that to have ignored it in the face of overwhelming evidence would have amounted to an error of law.
    220
    Post-contractual conduct is admissible on the issue of whether a contract was formed: Brambles v Bathurst CC [25] and the authorities there cited. Evidence of the parties’ subsequent communications is admissible for what light it may cast on their dealings from which the contract was said to have arisen: RJ Baker Nominees Pty Ltd v Parsons Management Group Pty Ltd [2010] WASCA 128 [66].
    221
    To justify the drawing of the inference then that, in attending the premises of Echo Marine for work on his first day, Mr Horne accepted the written offer from Execom, it was necessary that the evidence point unambiguously to that conclusion, and not merely be consistent with that inference while also consistent with a competing explanation, namely that he attended the workplace in fulfilment of a contract of employment with Moon Recruitment. The onus being on Execom in its application, it was for Execom to negative the inference. It could do so by establishing that the evidence did not point unambiguously to that conclusion and was – bearing in mind the standard of proof – as or more consistent with another explanation. I turn now to that finding by the arbitrator.
    The arbitrator’s finding that the Execom offer was not accepted by conduct on 2 September 2019
    222
    Moon Recruitment’s complaint primarily concerns the arbitrator’s overall conclusion that it was Moon Recruitment which was the employer and therefore liable for the workers’ compensation payments. But its argument to the contrary necessarily rested upon the premise that Mr Horne had accepted the Execom offer by conduct in turning up for work on his first day, resulting in the parties (Execom and
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    Mr
    Horne) having committed their relationship to a comprehensive written contract which, when construed objectively, rendered Execom the employer.
    223
    The arbitrator therefore determined two issues: whether the offer sent by Execom to Mr Horne was accepted by him by attending the premises of Echo Marine for his first day of work and then, in any event, which of the two putative employers was the party which contracted with him in such a way that he fell within the definition of ‘worker’ and was therefore his employer within the Act, and liable to make workers’ compensation payments. The onus lay on Execom, it being Execom’s application, to prove that it did not have a written contract with him by the time he was injured or that, if it did, it nevertheless was not his employer within the meaning of the Act.
    224
    The question of whether Mr Horne had accepted the Execom offer by conduct and prior to his injury logically preceded any issue concerning the effect of that alleged contract. The arbitrator found that he did not.
    225
    Moon Recruitment submitted that the existence of a contractual relationship and employment relationship, in any given set of circumstances, is ultimately a question of law, citing Damevski v Giudice [2003] FCAFC 252 (Damevski v Giudice) [60]. The passage referred to, however, in context, concerned the legal characterisation of a relationship in circumstances where an employer had attempted to reframe its employment relationship with its workers to replicate a relationship which was the subject of a ruling in another case, in order to avoid being an employer. It was unsuccessful. Where the only issue is the legal characterisation to be placed on a contract, the question will be one of law. Where the question turns upon the finding of relevant facts, and the drawing of factual inferences from those facts, it will be one of fact. And where the question is a two-step process of first considering the evidence to find the relevant facts, then determining what characterisation ought be put on those facts, it will be a mixed question of fact and law: Marshall v Whittaker’s Building Supply Company (1963) 109 CLR 210.
    226
    The issue before the arbitrator was whether, objectively, Mr Horne’s conduct in presenting for work on 2 September 2019 objectively and unambiguously indicated to a party in the position of Execom that he was thereby accepting the Execom offer sent to him on 30 August 2019. That was a question of fact. Resolving it involved
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    either drawing an inference to that effect or declining to draw an
    inference based on the facts: Carey [9], citing McHugh JA in Empirnall v Machon Paull (535). Importantly, it was accepted before the arbitrator that one of these entities had entered into a contract of employment with Mr Horne.
    227
    If, in deciding that question, the arbitrator took into account irrelevant material, or reached a conclusion that could not be reached on the evidence, then that was an error of law, although the conclusion need not have been in error. But the issue itself was a factual determination. As mentioned earlier, no error of law is involved in a wrong or doubtful finding of fact or inference drawn on the evidence, unless findings have been made without any evidence to support them: Erceg v Galati [31]. It is not the role of this court in determining an appeal to simply substitute its own decision. If there was an evidentiary basis for the finding made by the arbitrator, and no error of law involved, then there is no proper basis for disturbing the decision – not even if another decision might have been reached on the evidence.
    228
    The Execom offer was not executed by Mr Horne until 1 October 2019, a month after he was injured, and was not forwarded to Execom until 10 October 2019. The arbitrator noted [119] that, as the agreement had not been executed at the time of injury, then
    unless the evidence establishes there was acceptance by other means, the Execom/Moon (sic: Execom/Horne) agreement had not been executed at the time of the injury and was not therefore in effect.
    229
    The arbitrator found that Mr Horne turned up to work on his first day in fulfilment of his obligations pursuant to the contract of employment he had entered into with Moon Recruitment to provide his labour to Moon Recruitment’s client, Echo Marine. He found that contract to be ‘established by the following facts and circumstances’ set out at [126] of his reasons:
    Moon is a labour hire organisation. It entered into an agreement with Echo to provide labour services provided by Moon’s employees. Echo required fabricators. Moon advertised in SEEK for fabricators for Echo. Mr Horne responded to that advertisement. Ms Moon spoke to Mr Horne, received and considered his C.V., checked his credentials and referred his details to Echo. She arranged an interview with Echo, arranged a drug and alcohol test and then orally informed Mr Horne that he had been accepted for a three-month contract to work with Echo. Although Mr Horne does not recall any specific discussions with Ms Moon about pay, nonetheless it is clear that in those circumstances he was going to be paid for his services to Echo.
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    230
    It follows that the arbitrator drew the inference that Mr Horne had entered into a contract of employment with Moon Recruitment which was partly oral and partly supplied by law, with the advertisement forming part of the surrounding factual circumstances leading to that inference. The advertisement in SEEK had advertised a three-month position working in a boat building project at a site located in Henderson, with the successful applicant to be paid at a ‘competitive industry hourly rate’ with penalty rates after 40 hours. The company involved was named as Echo Marine.
    231
    Ms Moon testified that Mr Horne had been accepted following the drug and alcohol screen and she had then informed him that he had been accepted to work at Echo Marine. Mr Horne gave consistent but more detailed evidence that Ms Moon had told him he was starting at Echo Marine on the Monday. The dealings between Mr Horne and Ms Moon were the basis upon which the arbitrator found that Mr Horne had ‘already’ reached an agreement whereby he was employed at Moon Recruitment to work at Echo Marine, in keeping with which he had presented for work.
    232
    The arbitrator returned to this finding a little later, when dealing with one of the reasons why he considered that the decision in CFMMEU v Personnel was distinguishable [135]:
    In the current dispute, the purported Execom/Horne agreement was not executed by Mr Horne until sometime after his injury. Moon submits the offer of employment was accepted by Mr Horne’s conduct, by turning up to work at Echo on 2 September 2019. However, as earlier found, there was already a contract of employment in existence, with Moon, and I consider that consistent with the Moon/Echo agreement, Mr Horne turned up at Echo as fulfilling his obligations under the Moon employment contract.
    233
    That was the basis for his finding, namely that, by the time the Execom offer arrived, there was already an employment contract on foot for the reasons articulated in [126] and Mr Horne presented for work accordingly. The same reasoning was repeated later at [143] after the arbitrator had considered the Execom offer and the overall context of the arrangements between Moon Recruitment and Execom and Moon Recruitment and Echo Marine, so that extra facts were added to this conclusion:
    The Execom/Horne agreement does not establish that there was a contract of employment between Execom and Mr Horne in existence on the date of injury. The Execom agreement was not signed by
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    Mr Horne prior to his injury. The fact of Mr Horne attending at work with Echo does not lead to a conclusion that he was thereby accepting employment with Execom. He already had a contract of employment, with Moon. Further, although he had read the Execom agreement, he had not heard of Execom and merely assumed Execom was something akin to a subsidiary of Moon. He had otherwise no contact or prior dealings with Execom.
    234
    Having found that Mr Horne had become Moon Recruitment’s employee, the arbitrator found that the deeming provision in s 5 of the Act meant that he continued to be Moon Recruitment’s employee while he worked for Echo Marine and Moon Recruitment was therefore the entity responsible for the workers’ compensation payments.
    235
    Because the arbitrator considered the two questions, as to whether the Execom offer had been accepted by conduct and whether, in any event, Execom could be the employer, in a compendium way, a series of factors were referred to between those two quoted passages, without a clear delineating structure.
    236
    The arbitrator referred at [128] – [129] to the deeming provision in s 5 which, if Mr Horne had entered into a contract of employment with Moon Recruitment, had the effect that he continued to be employed by Moon Recruitment though his services were temporarily lent or let on hire to another. The arbitrator reasoned that, while Mr Horne was then let on hire to Echo Marine, he ‘continued’ to be employed by Moon Recruitment. In other words, once the arbitrator reached the conclusion that Moon Recruitment and Mr Horne had entered into an employment contract, and he had reached that conclusion, the Act deemed that employment to continue despite the worker being let on hire to another.
    237
    Moon Recruitment argues that the arbitrator erred in taking any account of the deeming provision. That submission will be dealt with under the next heading but, for now, it is sufficient to say that I reject that submission. I do accept that the deeming provision begged the question of whether Mr Horne had entered into a contract of employment with Moon Recruitment. But I do not consider that the arbitrator regarded the deeming provision as having created the contract of employment between Mr Horne and Moon Recruitment, as detailed in [126]. The arbitrator correctly described what the deeming provision achieved.
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    238
    The deeming provision did, however, have relevance to the overriding question of whether Execom was Mr Horne’s employer, and it was in that context that the arbitrator summed up the overall scenario presented by the facts, including the contract reached between Mr Horne and Moon Recruitment and the deeming provision and observed that:
    129 The above facts and circumstances in my opinion lead to a conclusion that the relationship between Mr Horne and Moon has all the hallmarks of a contract of employment, whereby Mr Horne had entered into a contract of employment to work for Moon, in that he was employed by Moon to work for Moon’s client for a fee rendered by Moon, where the fee contained a profit margin over and above the wages paid to Mr Horne.
    130 Otherwise, on what other basis was Mr Horne working at Echo?
    239
    The second sentence quoted above was, I infer, a reference to the fact that Execom had no contractual relationship with Echo Marine.
    240
    The two issues were related to each other, of course. The fact that Moon Recruitment recruited Mr Horne to work at Echo Marine, a fact that Mr Horne patently knew, was relevant to the question of whether he had accepted the Execom offer by conduct. It related to the competing inference that Mr Horne presented to work on his first day in accordance with an employment contract reached with Moon Recruitment for him to work for three months at Echo Marine.
    241
    The fee earned by Moon Recruitment did not cast light on that particular question, and was not referred to in the summary of factors in [126] that referred to Mr Horne’s dealing with Moon Recruitment and the reaching of an agreement between them. It was relevant to the overriding issue as to which entity was the employer. Again, Moon Recruitment argues that the arbitrator erred in taking any account of Moon Recruitment’s arrangement with Echo Marine. That submission will be dealt with under the next heading but, for now, it is sufficient to say that I reject the submission.
    242
    So the arbitrator inferred that Mr Horne presented for work pursuant to a contract of employment that he had entered into with Moon Recruitment to work at Echo Marine. Though the arbitrator did not use these words, it necessarily followed from his finding that Mr Horne’s conduct in presenting for work on his first day did not unambiguously indicate his acceptance of the Execom offer.
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    243
    Although the evidence did not all point in a single direction, I find that there was ample evidentiary basis for the arbitrator’s finding that Mr Horne did not, in presenting for work on 2 September 2019, accept the Execom offer by conduct. Or, to put that another way, I find there was ample evidentiary basis for the arbitrator to decline to draw the inference that, in presenting for his first day of work, Mr Horne must objectively be taken to have been accepting the Execom offer and not, instead, turning up for work pursuant to his agreement with Moon Recruitment. The arbitrator did not refer to all of the evidence below in his reasons though he alluded to it in his summary of the evidence or in his conclusions.
    244
    Moon Recruitment also made specific arguments that there was information provided to Mr Horne in the Execom offer that was not previously provided to him and therefore he must have accepted the Execom offer by conduct. This was part of an overall argument that there was no evidentiary basis for the arbitrator’s conclusion that the offer had not been accepted by conduct or, in the event of an error of law being made out, that the court should review the materials and find there was insufficient basis for the findings made.
    245
    Mr Horne testified that he had not been told by Ms Moon that the documents being sent through would be from another company, and that he thought Execom to be part of Moon Recruitment. The arbitrator did refer in his summary and his reasons to the evidence of Mr Horne to the effect that he did not know Execom to be a different entity and thought it to be the pay division of Moon Recruitment, having previously dealt with other businesses that had other names under the one umbrella.
    246
    That evidence was not irrelevant. His knowledge, or rather his lack of knowledge, as to Execom being a different and unrelated company from the entity he had been dealing with, and his belief that Execom was the pay division of Moon Recruitment had bearing, because an employer cannot unilaterally transfer an employee to another employer without the employee’s consent. The evidence as to what, if anything, Mr Horne had been told about Execom was sketchy. An employee could not consent to his employment being transferred to another entity if he was not given information that it was another entity, nor that his employment was being transferred. It was not inconsistent with Moon Recruitment employing Mr Horne that it should arrange for another entity to provide payroll services to it by paying him his wages: Damevski v Giudice [63], [91]. In so doing,
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    Moon
    Recruitment confirmed its intention that he receive wages for his work and caused that to occur. But it could not unilaterally transfer him, as though he was an asset, to another employer.
    247
    Further, given the ambiguity as to the role that Execom had in this proposed arrangement, the knowledge of the parties was admissible: Codelfa Construction Pty Ltd v State Rail Authority of New South Wales (1982) 149 CLR 337. Mr Horne’s knowledge was admissible as to whether the inference should be drawn that he had objectively indicated his acceptance of the Execom offer by conduct, rather than presented for work in accordance with an oral contract already reached with Moon Recruitment. His lack of knowledge that Execom was a different entity or that this offer was some new proposal distinct from what he had already agreed with Moon Recruitment was evidence tending against the drawing of an inference that he must have accepted the Execom offer in turning up for work on his first day, as opposed to having presented for work as already agreed and on the understanding that these documents were to be signed before he could receive his first pay.
    248
    Mr Horne had testified that he had received the email from Ms Woodman, telling him he was to start at ‘Echo Marine for Moon Recruitment’. The subject heading for the email read: ‘Contract for Moon Recruitment for Echo Marine Group’. The email read:
    Congratulations on your start at Echo Marine Group for Moon Recruitment (subject to a clear DAS) at 49 Clarence Beach Road, Henderson on Monday 2nd September 2019 at 7.00am.
    Please find attached contract, letter, Personal details, Tax and Super form.
    Please fill out all the forms and return them to me together with your contract before Monday the 9th September, 2019.
    Hope you have a good first day and give me a call if you have any queries.
    249
    The email informed him of his start time, on a day he already knew was his start date, at a job he already knew he had obtained, at premises he had already been to, and this email was consistent with the obvious, that he would be paid for his work. On its face it suggested that the author was communicating on behalf of Moon Recruitment.
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    250
    The email did not require Mr Horne to sign or accept the attached contract, or even read it, prior to commencing work on the Monday. The arbitrator did not mention this particular point, although the email was before him and plainly taken into account in his reasons. No finding of fact to that effect was needed – the document spoke for itself. Mr Horne had a full week to digest and fill in any attached forms. The fact that the offer need not be accepted prior to the commencement of work was a factor against drawing the inference that it had necessarily been accepted by conduct in presenting on his first day, and there was no express term in the offer to the effect that commencement at work would constitute acceptance of its terms. While an agreement can be reached without the formal execution being attended to on time, the express requirement was that acceptance occur prior to the first due payment, tending against the inference sought to be drawn. Execom only sent the offer because Moon Recruitment had already selected Mr Horne and told him that he had the job.
    251
    Attached to the email was a letter to Mr Horne commencing ‘Congratulations on your contract with Execom Personnel’, and thereafter containing the same information as the email of the same date, and still with an emphasis on him getting paid for the work. There was an obvious inconsistency between that letter and the email, which the arbitrator remarked upon. And then the Execom offer was itself ambiguous. That will be addressed in detail below under the next heading.
    252
    The arbitrator did state under his heading ‘Background information and issues in dispute’ that Mr Horne read the Execom offer on the day he received it. In fact that finding was generous to Moon Recruitment and was not repeated in the summary of Mr Horne’s evidence. The witness did not testify that he read the Execom offer on the day he received it. He was not asked when he had read it. He agreed that he read it before he signed it, and he signed it on 1 October 2019. The closest the evidence came was his agreement that he knew Execom was involved on 30 August 2019 ‘because they sent you an email’. He did not sign the offer before turning up for work on his first day, and so there was no presumption that he had read it. To the extent that his evidence was overstated, the error favoured Moon Recruitment.
    253
    Moon Recruitment’s main submission was to the effect that the Execom offer had provided Mr Horne with information that had not been provided to him by Moon Recruitment, and therefore his attendance at the workplace on 2 September 2019 could only have
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    been in response to his acceptance of that offer. In written submissions,
    Moon Recruitment highlighted (in purple) matters contained in the Execom offer which ‘were not found in any words or conduct between Horne and Moon Recruitment’.
    254
    Clause 1 of the Execom offer provided that Mr Horne undertook to supply such services for clients of Execom as were set out in the schedule. This was said to be new to Mr Horne. The services were ‘Fabricator Welder’, which Mr Horne already knew. The schedule did not name either Echo Marine or Moon Recruitment as the ‘client’ – more of that under the next heading – but it did provide the ‘address for provision of services’ as ‘Echo Marine Group which is located at 49 Clarence Beach Road, Henderson’. The offer suggested but did not directly claim that Echo Marine was Execom’s client.
    255
    Mr Horne was not privy to the lack of relationship between Execom and Echo Marine because he knew almost nothing about Execom, but the facts of which he was aware must have indicated to him that Moon Recruitment had a client in Echo Marine. The Execom offer did not objectively contradict his understanding that Moon Recruitment and Execom were the same business or in the same group of businesses, with Echo Marine as a client.
    256
    The address for provision of the services was not new to Mr Horne. He already knew he was to work at Echo Marine. Ms Moon had told him that he been successful in getting the job and he testified that she told him he was to start the following Monday.
    257
    The schedule in the Execom offer provided details as to how to arrive and gain access and the person to whom he should speak, with a phone number. The schedule advised him to wear personal protection equipment and told him he would be provided with a hard hat and safety glasses and a clock card. The evidence indicated however that, by the time he received the Execom offer, Mr Horne had already been to Echo Marine to demonstrate his welding capabilities, and Ms Moon had already provided him with fluorescent clothing to meet the client’s safety requirements and told him to go in and meet the foreman, whose name he could not now recall. The arbitrator did not go into quite this level of detail in his summary of his reasons, but he did expressly take into account and accept the evidence of the conversation with Ms Moon whereby she informed Mr Horne that he had the job, and this was the unchallenged evidence.
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    258
    The Execom offer did contain the precise rate of pay that Mr Horne would receive. Execom had that pay rate figure from Moon Recruitment once Ms Moon had selected Mr Horne. Mr Horne testified that did not recall Ms Moon informing him that Moon Recruitment would pay him (consistent with the arrangement that Moon Recruitment had reached with Execom). Ms Moon testified that she did not recall informing Mr Horne what his rate of pay would be. Moon Recruitment submitted, therefore, that the dealings between Moon Recruitment and Mr Horne had left the matter of the pay rate undetermined – which the arbitrator impliedly accepted – and that agreement on price is generally regarded as necessary to a concluded contract. It argued therefore that Moon Recruitment and Mr Horne had not reached a concluded bargain and, therefore, the Execom offer was the only offer on foot when Mr Horne presented for work, leading to the inference of acceptance of that offer by conduct. The arbitrator rejected the argument.
    259
    While it is not necessary to be able to identify a precise offer or acceptance or to identify the precise time at which an offer was accepted, it is necessary to conclude that a reasonable person in the position of each party to the alleged agreement would think there was a concluded bargain: Mushroom Composters [60] and the authorities cited therein. An alleged contract will fail for incompleteness if a term which is regarded as essential at law has not been agreed between the parties: Mushroom Composters [62] and the authorities cited therein.
    260
    While it may be accepted as a general principle in relation to many types of contracts, such as contracts for the sale of goods or the sale of land, that price is an essential term to a concluded bargain, the arbitrator dealt with that submission by his observation that ‘nonetheless it is clear that in those circumstances he was going to be paid for his services to Echo’. In other words, the arbitrator found that a court would necessarily imply a term into any contract of service between Mr Horne and Moon Recruitment that Mr Horne was going to be paid for his services at Echo Marine. To that observation should be added that the advertisement to which Mr Horne responded advertised that the worker would be paid competitive industry rates.
    261
    For a term to be implied into a contract, it must be reasonable and equitable, necessary to give business efficacy to the contract, so obvious that it goes without saying, and must not contradict an express term of the contract: BP Refinery (Westernport) Pty Ltd v Shire of Hastings (1977) 180 CLR 266, 283. The implication of a term
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    into a contract between Mr
    Horne and Moon Recruitment that he was to receive a reasonable wage for his work would meet such criteria. Such a term would be well capable of enforcement in a court as an implied term. If Execom had never entered the scene, and Mr Horne had presented for work at Echo Marine and not received his wages, Moon Recruitment could not have persuaded a court that it was not liable to pay his wages.
    262
    An argument could even be made, if it came to it, that in providing Execom with the pay rate for Mr Horne and causing Execom to send that information to Mr Horne, Moon Recruitment would be estopped from denying that he was entitled to be paid at that precise rate, because this was not a binary choice between Mr Horne either looking at the Execom email and/or attached documents and thereby necessarily accepting the Execom offer by turning up for work, or ignoring the documents and gaining nothing from them whatsoever.
    263
    But, in any event, the arbitrator decided the issue on the basis that the law would imply a term in an oral agreement between Moon Recruitment and Mr Horne that he would be entitled to be paid for his work. There was a clear basis for finding that such a term would be implied at law. The mechanics of how Mr Horne was to receive his wage were not essential to that agreement. But it was open to the arbitrator to find, as he did find, that the arrangement whereby Mr Horne was to be paid by Execom (at a rate fixed by Moon Recruitment) was a mere payroll function. Payment of wages by a third party is not fatal to the existence of a contract of employment.
    264
    Moon Recruitment argued that, in addition to the pay rate, a number of essential terms had not been articulated by Ms Moon in her dealings with Mr Horne, namely the service he was to provide (he had done his welding test at Echo Marine and the job was for a fabricator), the address he was to work at (he had been there), when, where and to whom to report for duty (again, he had been there and his unchallenged evidence was that he had been told to start Monday and report to the foreman).
    265
    Moon Recruitment also relied upon the fact that it had not provided Mr Horne with a written offer of employment. It was not necessary for Mr Horne to be presented with a written offer of employment by Moon Recruitment. In Damevski v Giudice [84] Marshall J observed:
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 Although there was no formal offer of a new employment contract, it is not uncommon for two commercial entities to informally enter into a contract. There is no reason to treat an employment relationship any differently. The agreement between the two can be evinced from their conduct.
    266
    Counsel for Moon Recruitment did establish through Mr Horne in cross-examination that he had ‘accepted’ the contents of the Execom offer, but the questioning was, with respect to counsel, so general and so loaded (and the witness so often confused by such questions) that the responses failed to prove anything determinative, and quite rightly did not make it into the arbitrator’s summary. Counsel also established that Mr Horne did not ‘object’ to the contents of the document when it was sent to him, but that also did not advance the case.
    267
    If the question to the effect that, following his dealings with Ms Moon, she had ‘indicated to you that there was a prospect of you getting a job working – doing work for Echo Marine’ was supposed to establish that, prior to receiving the Execom offer, there was only a ‘prospect’ of his getting the job, then the question quite misstated his previous evidence that, following his interview at Echo Marine and his welding test, Ms Moon had contacted him and told him that ‘Echo wanted me to start subject to a blood test for drugs’ and that he was to
    go in there, I think it was the Monday morning. Meet the foreman 
 Go through all the basic about the company, all the (indistinct) gave me a little box of tools, and then I just started on that Monday.
    268
    At most the witness agreed that he had not received any such written documentation from Moon Recruitment – that was uncontroversial – and that he ‘accepted’ what the Execom offer proposed, but the question as to the latter was insufficiently direct to establish what was meant by it, and what the response would thereby signify. While counsel may have been focused on what the conduct objectively might have signified, there were two competing scenarios under consideration and the questioning did not serve to distinguish whether Mr Horne had accepted the Execom offer by conduct in turning up for work on his first day, or turned up for work in response to his prior dealings with Ms Moon. And, considered from an objective view, the evidence did not all, or substantially, point towards the inference sought to be drawn against Execom.
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    269
    Weeks after the event, Mr Horne signed that Execom offer. The arbitrator did not mention that in his concluding reasons. The evidence was arguably relevant, not as a matter of post-contract performance but, rather, as evidence potentially going to Mr Horne’s state of mind back at the time he presented for work. It might have been regarded as a piece of evidence consistent with the terms of the Execom offer being acceptable to Mr Horne as of 2 September 2019 when he turned up for work, coupled with a desire to later evidence that that acceptance had occurred. The evidence was not compelling, however because, by the time he eventually signed the offer, the landscape had significantly changed. He had been injured and incapacitated. The desire to formalise his financial arrangement at that time by signing the only written offer in existence therefore did not carry weight as it might have, had he not been injured and simply executed the contract substantially later than requested.
    270
    The arbitrator did not dwell on post-contract conduct at all. There was little post-contract conduct in any event, given that Mr Horne was injured on his first day of work. Consistent with his finding, Mr Horne turning up to work was post-contract conduct consistent with his performance of his contract with Moon Recruitment.
    271
    The evidence before the arbitrator referred to in the reasons captured in the preliminary background summary and [126] of the reasons was capable of establishing that Mr Horne had reached a concluded bargain with Moon Recruitment that he was to be employed by Moon Recruitment for the purpose of working as a welder/fabricator at the premises of Echo Marine for three months at a reasonable wage on the basis that he was to perform the tasks required of him at Echo Marine by its supervisors and to start when he did start. There was some additional evidence referred to above which did not detract from that conclusion. The evidence was also capable of establishing that, by presenting for work on 2 September 2019, Mr Horne was acting pursuant to the agreement he had reached with Moon Recruitment and starting at Echo Marine as arranged. The evidence did not unambiguously point to an acceptance of the Execom offer by conduct, because there was another inference that was consistent with the evidence.
    272
    The evidence summarised in [126] of the arbitrator’s reasons justified the finding that Mr Horne had entered into a contract of employment with Moon Recruitment, a contract which was party oral and into which the law would imply certain terms, including that he
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    would be paid at a reasonable rate. The parties were identified,
    there was consideration flowing from both sides, the nature of the work and the timeframe had been identified and the work was on a casual basis. There was further evidence that was not all detailed in the conclusions reached, such as the provision to Mr Horne of Moon Recruitment’s uniform. The evidence was inconsistent as to whether it bore a Moon Recruitment logo.
    273
    Taking into account the background facts which a reasonable person in the position of the parties would have known, namely that Moon Recruitment had a contractual arrangement whereby it was providing staff to Echo Marine, a reasonable person in the position of Mr Horne, whose dealings were with Moon Recruitment as outlined by the arbitrator, would have been led to believe that he had just been employed by Moon Recruitment to work at Echo Marine. A reasonable person in the position of Moon Recruitment and in possession of the background facts which included the basis upon which it had contracted with Echo Marine, would have been led to believe that it had just employed Mr Horne to work at Echo Marine.
    274
    There being an evidentiary basis for the finding, there was no error of law in the finding and no proper basis for this court to disturb the finding made by the arbitrator. On that basis, the Execom offer was not accepted and on foot on 2 September 2019, and the entity which was the employer of Mr Horne as at the time of his injury was Moon Recruitment. Had I found an error of law under the next heading, it is fair to say that a review of the materials before the arbitrator would have led me to the same factual conclusion as the arbitrator on this issue.
    275
    In case I am wrong in the above finding and, in any event, because the arbitrator considered the two issues as one compendium issue, it is necessary to consider the complaint that the arbitrator took into account irrelevant matters in concluding that Moon Recruitment had employed Mr Horne, and Execom had not. I turn to that final issue now.
    Did the arbitrator err in taking into account irrelevant matters in reaching his conclusion that Moon Recruitment had employed Mr Horne?
    276
    Moon Recruitment submitted that, because the onus lay on Execom in its application pursuant to s 71 of the Act to establish that Mr Horne had not been lawfully entitled to workers’ compensation
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    payments from Execom, then it was questionable as to whether it had
    ever been the function of the arbitrator to regard his task as being to decide which of the two parties had been the employer, as opposed to confining his consideration to whether Execom had proved that it did not enter into a contract of employment with Mr Horne and, only if that was established, to then consider Moon Recruitment’s liability.
    277
    I do not accept that proposition. One of the evident purposes of the Act is to ensure that an injured worker is covered by workers’ compensation payments. Section 71(2) empowered the arbitrator in an appropriate case to shift liability to pay compensation from one supposed employer to another, rather than order an injured worker to reimburse money received, leaving him to seek it again from another party. This was an appropriate case, because there was no suggestion that the worker was not entitled to workers’ compensation payments and it was accepted that one of two parties had been liable to make those payments pursuant to the Act. The worker was only potentially ‘not lawfully entitled’ to the payments because they had come from a party not liable to make them. In such circumstances, the issue was a question of which party had liability.
    278
    Any other interpretation requires the party which made the payments to prove in a vacuum that it was not liable to make those payments, without being able to advance the case that another party was liable, which may be the very basis why it was not liable. Such an interpretation is superficial. It is particularly superficial where, as here, an argument was made that an offer of employment by one of the parties had been accepted by conduct. In assessing whether an offer has been accepted by conduct, it is logically necessary to consider any competing inference to determine whether the evidence does point unambiguously towards an acceptance of the offer by conduct. It was appropriate – it was logically necessary – that the arbitrator consider the dealings Mr Horne had with both Moon Recruitment and Execom in order to assess the competing scenarios.
    279
    Execom denied that the Execom offer, even if accepted by conduct, established a relationship of employment in any event. It argued that the Execom offer was merely Execom’s means of providing payroll services to Moon Recruitment as agreed between those two parties, and that an examination of the relevant circumstances indicated that Execom could not have been Mr Horne’s employer, despite it agreeing to arrange workers’ compensation insurance for him.
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    280
    Moon Recruitment argued that its agreement with Execom was irrelevant, as were matters outside the purported written contract between Execom and Mr Horne and that, on the basis that the Execom offer had been accepted by conduct, Execom was his employer. In answer to Execom’s proposition that the Execom offer was merely its means of providing payroll services to Moon Recruitment as agreed, Moon Recruitment pointed to aspects of the Execom offer which went beyond what was required for the provision of a mere payroll service. It further contended that Execom may have chosen to provide those payroll services by employing the worker and if, in so doing, it breached its agreement with Moon Recruitment, that did not alter the objective interpretation to be placed on the Execom offer to Mr Horne.
    281
    As a starting point, I find that the arbitrator was justified in distinguishing CFMMEU v Personnel from the current matter. The basis upon which he did so was twofold: that CFMMEU v Personnel had not involved the application of the Act, and that the contract in that case had been executed by the parties. Both points of distinction were correct, as far as they went, but there is more to be said.
    282
    The court in CFMMEU v Personnel was concerned with determining whether the character of the relationship between Construct and the worker, it being uncontroversial that the relationship was between those two parties, was one of employment, rather than principal and independent contractor. The majority of Kiefel CJ, Keane and Edelman JJ [59], Gordon J [187] – [189] and Steward J [203] on this aspect found the multifactorial approach to be problematic in determining the character of the relationship, at least where the parties have chosen to commit their agreement to a comprehensive written agreement and there is no other issue – such as a question of whether the contract is a sham, or a question of agency, estoppel, or variation or abandonment of a contract, or a particular statutory purpose behind clauses in the contract – to justify or require the court to look beyond its terms. Even then, the court still allowed that the surrounding factual matrix in which a contract was made is still relevant, but its relevance will be determined by the issues to be resolved.
    283
    The issues in this case were different. It was not in issue that Mr Horne had entered into a contract of employment with one of two entities. The issue was not one of characterisation of a relationship established by a comprehensive contract but was, rather, one of contract
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    formation, and the identity of the entity which had engaged Mr
    Horne, whether by written or oral contract, such that he came within the definition of a ‘worker’ in the Act. That served to distinguish the decision in CFMMEU v Personnel from the current matter. The decision in Agrigrain v Rindfleish puts persuasive authority behind the legitimacy of recognising the distinction to be drawn between those cases calling for a characterisation of a relationship based on a comprehensive written contract and a case in which a choice is to be made between two putative employers. But in any event, the majority judgments in CFMMEU v Personnel allowed that differing circumstances would determine the approach to be taken, and the principles in that case were expressly directed to respecting the parties’ decision to commit to a comprehensive written contract.
    284
    The contractual question remains what a reasonable person in the position of the relevant parties would have understood as to the identity of the employer and the terms and effect of any contract. This was also not a binary choice between whether Mr Horne had entered into some sort of contract with Execom or not. It was possible for Mr Horne to have entered into a contract with Execom whereby it was to be the entity which paid him, without that determining the contest between putative employers. The arbitrator found that the Execom offer was not accepted by conduct and on foot at the time Mr Horne was injured but, in any event, the question was as to which of the two entities was his employer.
    285
    In those circumstances, both in determining whether an inference should be drawn that the Execom offer had been accepted by conduct and in determining, in any event, which of the two entities had employed Mr Horne, it was permissible to consider the surrounding circumstances known to the parties – all relevant parties, not just Execom and Mr Horne, but Moon Recruitment too – and the objective purpose and object of the arrangement reached. The process of reasoning the arbitrator embarked upon was an enquiry into what the reasonable person would have understood from the arrangements entered into between Moon Recruitment and Mr Horne, and Execom and Mr Horne, armed with all the background knowledge of the underlying facts which would have reasonably have been available to the parties – Execom, Moon Recruitment and Mr Horne – in order to determine which of the two putative employers was the true employer.
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    286
    The Execom offer to Mr Horne did not occur in a vacuum. Execom had had no dealings with Mr Horne before making the offer to him. It had not recruited him, interviewed him or made any decision concerning him. It did not decide what he would be paid for his services, because Moon Recruitment told Execom what he was to be paid. Mr Horne, for his part, had an erroneous understanding of who Execom might be, a relevant fact in itself as it demonstrated his lack of connection with that business and lack of any knowledge that he may be contracting with a new entity. The Execom offer was only made to Mr Horne because of Execom’s contract with Moon Recruitment.
    287
    That is because a critical contextual fact in this case was that Execom had no contractual relationship with Echo Marine. It had no basis upon which to purport to employ a worker, or engage a contractor, to work at Echo Marine. Its only reason to mention Echo Marine in the Execom offer was because of its contract with Moon Recruitment. In those circumstances, and given the issues to be determined, to confine a consideration of the relevant matters as suggested by Moon Recruitment, such that the Moon Recruitment/Execom agreement was irrelevant, risked placing an interpretation upon the Execom offer which resulted in a commercial fiction with no business efficacy.
    288
    Evidence was led from both Ms Woodman and Ms Moon about Moon Recruitment’s arrangement with Echo Marine but the arbitrator was correct to examine, to the brief extent necessary, the primary evidence of the Moon Recruitment/Echo Marine agreement, the schedule of rates from which was put before him. That schedule established that, as between Moon Recruitment and Echo Marine, Moon Recruitment objectively held itself out as, and agreed that it was, the employer of any worker it sent to Echo Marine. In accepting the assignment of any Moon Recruitment ’employee’, Echo Marine agreed that it accepted Moon Recruitment’s rates and other terms, that rate consisting of ‘the hourly rate to be paid the workers as well as workers compensation, payroll tax, superannuation, PI & PL insurance and our agency margin’.
    289
    Echo Marine therefore had a contractual arrangement by which it was not responsible for arranging mandatory insurance and paying payroll tax, that obligation lying with Moon Recruitment. No evidence was put before the arbitrator to suggest that, as any part of that arrangement, Echo Marine had agreed that Moon Recruitment could nominate another entity to employ the workers and meet those
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    statutory obligations.
    Moon Recruitment was far more than a mere recruitment agency for Echo Marine. It was a labour-hire organisation which agreed to supply its workers to Echo Marine.
    290
    I do not consider that the arbitrator erred in law by having regard to the Moon Recruitment/Echo Marine agreement to the extent that he did. The agreement might have provided some basis upon which Execom could engage a worker instead of Moon Recruitment, or as an agent for Moon Recruitment. It failed to do so. No case law, or other legal basis, was put before the arbitrator to explain how it could be said that Execom had an ability to engage a worker (however that relationship was to be characterised) at the premises of Echo Marine, subject to Echo Marine’s control and supervision, without Echo Marine’s knowledge and consent. The evidence established there was no such knowledge and consent. The arbitrator was correct in both taking this fact into account and in placing significant emphasis on it.
    291
    It is no answer to say that Execom may have breached its agreement with Moon Recruitment by choosing to employ Mr Horne, but yet that was the agreement it reached with Mr Horne. The submission overlooks the point that Execom had no basis upon which to engage a worker to work at Echo Marine. Echo Marine was not irrelevant to this consideration. It occupied the premises that Mr Horne was to attend for work.
    292
    Execom did not even clearly purport to have any agreement with Echo Marine in the Execom offer, which was non-committal as to its relationship with Echo Marine, suggesting but not actually claiming that Echo Marine was it client. As will emerge below, the Execom offer was ambiguous and internally inconsistent. In such circumstances, it was permissible to have regard to the object and purpose for which it was made in order to cast light on its proper construction.
    293
    To that end, it was necessary to understand the basis upon which Execom came to be making such an offer to Mr Horne. And that basis was the Moon Recruitment/Execom agreement. It was not an error of law for the arbitrator to consider this agreement. In CFMMEU v Personnel, the court spent only a small time considering the very basic effect of the LHA, to which the worker was not privy, because his worker’s contract was not impacted by it. That is not the case here.
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    294
    It was clear from the evidence that Ms Moon and Ms Woodman had knowledge of the Moon Recruitment/Execom agreement, because they personally drafted and agreed upon its terms. Both also had knowledge of the Moon Recruitment/Echo Marine agreement: Ms Moon had executed it and Ms Woodman was familiar at least with the manner in which Moon Recruitment dealt with its labour-hire clients, of which Echo Marine was one, and therefore had a basic understanding of that arrangement.
    295
    Mr Horne was not privy to the Moon Recruitment/Execom agreement. There was sketchy evidence about what he may or may not have been told about Execom prior to receiving the Execom offer. The arbitrator did not base his reasons on anything Mr Horne was told. One thing Mr Horne plainly understood, however, is that the Execom offer came to him because of some connection between Execom and Moon Recruitment and the work he was engaged to do at Echo Marine. His understanding that Execom was the pay division of Moon Recruitment contained some kernel of truth. He just had an erroneous understanding that they were related companies.
    296
    A reasonable person in possession of the relevant facts, however, would have been in possession of a basic understanding of the relationship between Moon Recruitment and Execom before executing any agreement with Execom, given that all his dealings to that point had been with Moon Recruitment.
    297
    Mr Horne was not privy to whether or not Execom had a contractual arrangement with Echo Marine. He had, at most, been given to understand or assumed that Execom and Moon Recruitment were the same or related, and must have been aware that Moon Recruitment had an arrangement with Echo Marine sufficient to recruit workers to work there, given that he was recruited to work there. There is no evidence that he asked any questions about whether Execom had a contractual arrangement with Echo Marine.
    298
    According to Moon Recruitment’s submissions, the arbitrator was expected to restrict his reasoning to common known facts, making any knowledge possessed by Mr Horne the lowest common denominator in considering the factual matrix in which the Execom offer was made.
    299
    I reject that approach for several reasons. Firstly, the factual matrix underlying the making of the Execom offer consisted of the facts that a reasonable person in possession of the background knowledge
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    reasonably available to the parties would have known. A reasonable
    person being offered some form of employment or engagement by one company at the premises of a different company would have known, because they would have made it their business to know, whether the company offering the employment had some contractual basis upon which to do so. The fact that Mr Horne made an erroneous assumption and was not armed with the correct factual position does not restrict an arbitrator or a court to an erroneous factual matrix or an absence of knowledge of the basic underlying relevant facts.
    300
    Second, as will be detailed below, the Execom offer was ambiguous and internally inconsistent, justifying recourse to the knowledge and intention of the parties underlying the purpose and object of the contract.
    301
    Third, the agreement under consideration did not have to be found ultimately to constitute a sham at law before the arbitrator could have regard to the underlying facts and purpose of the agreement to determine whether the Execom offer did involve some form of fiction and was a sham, irrespective of whether the worker involved was privy to all of those facts.
    302
    While Moon Recruitment was certainly not arguing that the Execom offer was a sham, Execom (or at least its insurer) was arguing that the offer was merely the means by which Execom was to provide payroll services and that it had not been in a position to offer him any contract for services at Echo Marine because it had no contractual relationship with Echo Marine. The submissions before this court expressly raised the issue of whether the Execom offer amounted to a sham in so far as it might be seen as an offer of employment. It was Execom’s stance that the offer was a flawed attempt at providing payroll services and not a sham unless it was to be interpreted on its face as an offer of employment. Of course, a contract does not become a sham because of a court’s interpretation of it – rather, it is recognised as a sham – but the point of the submission was that the Execom offer might, due to a flawed understanding and drafting attempt, be regarded as something which it was not.
    303
    Although CFMMEU v Personnel could legitimately be distinguished on the basis of the issues to be determined, it was also not inconsistent with the principles in CFMMEU v Personnel for the arbitrator to take into account the broader factual context in which the Execom offer was made, given the ambiguity and inconsistency in
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    the Execom
    offer which, as will be seen below, consisted of purporting to engage a worker on behalf of its client while not clearly identifying who that client was, and both denying any relationship of employment or service, yet also assuming an obligation to take out workers’ compensation insurance. The merest enquiry would expose Execom’s lack of contractual relationship with Echo Marine, which raised the question of a potential sham transaction and/or an attempt to contract out of the provisions of the Act.
    304
    It was only by reference to the underlying factual context of the Moon Recruitment/Execom agreement and the evidence that the insurer, or at least its agent, was consulted that both the Moon Recruitment/Execom agreement and the Execom offer could be seen to be lacking that objective intention to deceive a third party that is an ingredient of a sham transaction. It does not follow, however, that there did not remain an artificiality about the arrangement.
    305
    Further, given that CFMMEU v Personnel was distinguishable on the facts and issues to be considered and, in any event, provided scope for a broader enquiry in various circumstances, and given the issue to be determined in this case, namely which of two potential employers was the true employer, it was proper for the arbitrator to have regard to the factual context underpinning the arrangements made. In a case in which the issue is one of contract formation and the identity of the employer, that relevant factual context included any corporate structure underlying the contractual arrangement and informing the object and purpose of the offer of employment and the commercial purpose underlying the choice of one employer over another, despite the worker’s lack of knowledge, or limited understanding, of such matters. Regard may also be had to applicable legislative schemes where they have a bearing on the question of which entity entered into the contract of employment, without being limited by the worker’s understanding of such matters.
    306
    It follows that I consider that the arbitrator did not err in having regard to the Moon Recruitment/Execom agreement and to the Moon Recruitment/Echo Marine agreement for the purpose of considering the underlying factual context in which the Execom offer came to be made. Those arrangements constituted the objective arrangements reached rather than the witnesses’ subjective understanding of the legal effect of those arrangements. As was dealt with earlier in these reasons, the arbitrator well understood the difference and did not base his conclusions on subjective opinion
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    evidence but, rather, the objective arrangements reached
    , which then informed the contest between the two potential employers, as to which was in fact the employer. I turn now to those contractual arrangements.
    307
    The Moon Recruitment/Execom agreement came first in time, having been executed on 21 December 2015, well before Mr Horne was on the scene. Moon Recruitment was defined as ‘the client’. For a fee, Execom agreed to provide payroll services (paying wages, superannuation contributions etc) to Moon Recruitment for the workers which Moon Recruitment was to provide to its own clients on a labour-hire basis. Execom also agreed to arrange and maintain workers’ compensation insurance for those workers. Moon Recruitment was to reimburse Execom for those expenditures, and pay its fee, within 30 days of receiving its invoice. The arbitrator described that fee as ‘nominal’ by contrast to Moon Recruitment’s agency fee to its own client, in this particular case Echo Marine: [139].
    308
    The agreement overall enabled Moon Recruitment to postpone incurring the expense of wages, superannuation contributions and insurance premiums for the workers until after it had received payment from its own client to whom it had provided the workers on a labour-hire basis. There was evidence, admissible as background facts informing the purpose of this contract and accepted by the arbitrator, that Execom was a larger operation and financially better placed to be able to bear those costs until it was reimbursed by Moon Recruitment, once Moon Recruitment had received its rate from its own client, the host project. Execom and Moon Recruitment were not related companies and this was not a corporate structuring arrangement.
    309
    Moon Recruitment was to ‘make available’ to Execom ‘the contractor’ – ultimately Mr Horne – on the following basis (paraphrased):

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