21 There has been a recent discussion of the term "collateral contract" in the New South Wales Court of Appeal in Grygiel v Baine & Ors (2005) NSWCA 218. Mason P agreed with the reasons for judgment of Basten JA. Basten JA said:
"[66] The question is whether the statutory reference to a contract being "collateral to" another contract invokes a term of art, having a particular legal connotation. The concept of a collateral contract was developed in relation to a promise or representation by one party to another, as a result of which the latter either enters into a separate contract with a third party, or enters into a contract with the representor. In each case, the promise or representation is the consideration for the subsequent contract: see generally Heilbut Symons & Co. v Buckleton [1913] AC 30 at 47; Kavanagh v Blissett [2001] NSWCA 79 and Matland Holdings Pty Ltd v NTZ Pty Ltd [2004] FCA 710 (Kenny J). It follows that a "collateral contract" cannot be formed after the main contract has come into existence, as otherwise that contract would constitute an inadequate (past) consideration for the new contract: see Hercules Motor Pty Ltd v Schubert (1953) 53 SR(NSW) 301.
[67] The term "collateral contract" may be used in relation to a contract involving at least one third party, namely a person not party to the principal contract, to which the other was collateral. As is illustrated by State Rail Authority of New South Wales v Heath Outdoor Pty Ltd (1986) 7 NSWLR 170, pre-contractual representations could attract equitable relief where "the enforcement of strict rights is unconscionable because the assurances given before the execution of a written contract were made orally": per McHugh J at p.195C. Relief of a similar kind may now be obtained under the Trade Practices Act 1974 (Cth) or the Fair Trading Act 1987 (NSW). Indeed, these considerations suggest that reliance on a collateral contract will rarely be necessary if the supplier or recipient of building services has some claim for payment of money (or other relevant relief) arising from the supply. Where services are supplied which fail to meet some expectation based upon a representation, the supply will be an inevitable element of the claim and the claim will, in that sense arise from the supply, as well as from breach of the representation.
[68] Even if there are some cases in which it is necessary to rely upon a contract collateral to the contract for supply, this reasoning suggests that no constrained meaning should be given to the word "collateral" in this statutory context. In this regard, counsel for the Claimant took the Court to David Securities Pty Ltd v Commonwealth Bank of Australia (1992) 175 CLR 353, where the High Court considered the meaning of the term "collateral agreement" in s 261(5) of the Income Tax Assessment Act 1936 (Cth). That section related to payment of income tax on interest payable under a mortgage and defined the term mortgage to include "any charge, lien or encumbrance to secure the repayment of money, and any collateral or supplementary agreement ...". The case involved loan agreements and securities by way of mortgage, and the argument below had turned upon whether the concept of a collateral agreement involved the notion of primacy and, if so, which agreement was primary and which subordinate. In the course of rejecting such a notion, the joint judgment of Mason CJ and Deane, Toohey, Gaudron and McHugh JJ stated, at 365:
"Collateral contracts are so-called not because they are subordinate or of lessor importance (although they may well be, depending on the facts of the case), but because they impinge upon and are related to another contract. ... Once the notion of primacy is jettisoned, 'collateral' must be understood in the sense of 'related to' or even 'in addition to'."
There is no reason to be derived from the present statutory context not to apply a similar analysis. (See also Spigelman CJ in Solution 6 Holdings Ltd v Industrial Relations Commission of NSW [2004] NSWCA 200 at [41].)"