The matter was put in the following terms by the Chief Justice (at 550 and following) with whose reasons for judgment Hope and Mahoney JJA agreed:
"…The case involves the objective determination of the intention of the parties from a consideration of a series of communications exchanged by them in the context of their dealings over a period of time. In those circumstances it is both appropriate and necessary to have regard to the commercial circumstances surrounding the exchange of communications and, in particular to the subject matter of those communications: Allen v Carbone (1975) 132 CLR 528 at 531-532. Furthermore, as was noted earlier, it is proper to have regard to communications between the parties subsequent to the date of the alleged contract to the extent to which those communications throw light upon the meaning of the language which is being considered for the purpose of determining whether it expresses an intention one way or the other upon the critical matter. At the least, such subsequent communications will often form part of the context in which the particular exchanges in question are to be evaluated.
The position is by no means so clear, however, in connection with internal memoranda… or statements as to subjective intention made by individuals in the course of giving evidence. As it happens, although the learned judge had a good deal of material of this kind put before him at the hearing, it was not particularly helpful even if admissible. In the first place, a great deal of it was equivocal and individual pieces of evidence were contradictory in effect. Some of the persons who participated in the negotiations in question were called to the witness box and vigorously examined as to what was going on inside their minds at particular times. This process in the end principally served to demonstrate what might have been expected to be the case, that is to say, that the witnesses, not being lawyers themselves, were in a state of considerable confusion about the issue that ultimately emerged as determinative of the rights of the parties…
In so far as acts or statements of the kind referred to, not involving communications between the parties, are claimed to be relevant in a case such as the present upon the ground that they constitute an admission, it seems to me that it will often be necessary to identify with some care the fact which is said to have been admitted. As was noted, there may be cases in which the issue is such that the fact of the subjective state of mind of one or other of the parties is relevant. Normally, however, what is in issue is not their subjective state of mind but their "intention as expressed" (cf Inland Revenue Commissioners v Raphael [1935] AC 96 at 142 per Lord Wright) and caution may need to be exercised in relating the fact which is said to be admitted to the fact which is legally relevant."
[emphasis added]
Novation
13 Novation is a transaction by which, with the consent of all parties concerned, a new contract is substituted for one that has already been made. Intention is crucial to show a novation. A novation may be express or implied from the circumstances. However, when searching for such an intention, no narrow or pedantic approach is warranted, particularly in the case of commercial arrangements. Novation may be inferred from evidence of informal conversations and the subsequent consistent pattern of conduct of the parties: Fightvision Pty Ltd v Onisforou & Ors (1999) 47 NSWLR 473 at 491-493.