So far as the second matter is concerned, I do not consider that any implication of an intention not to be legally bound which might otherwise be suggested by the words "agreement in principle" can prevail over the clear import of the words "legally binding". The intention of the parties to be legally bound by their consensus is sufficiently clearly expressed to take the case out of the third class of cases referred to in Masters v Cameron (1954) 91 CLR 353 at 360-362, that is, " … cases in which the terms of agreement are not intended to have, and therefore do not have, any binding effect of their own" (at 361). There is in reality a fourth class of case additional to the three mentioned in Masters v Cameron , as recognised by Knox CJ, Rich J and Dixon J, in Sinclair, Scott & Co v Naughton (1929) 43 CLR 310 at 317, namely, "… one in which the parties were content to be bound immediately and exclusively by the terms which they had agreed upon whilst expecting to make a further contract in substitution for the first contract, containing, by consent, additional terms". Their Honours refer to the speech of Lord Loreburn, in Love & Stewart v S Instone & Co (1917) 33 TLR 475 at 476, where his Lordship said that:
"It was quite lawful to make a bargain containing certain terms which one was content with, dealing with what one regarded as essentials, and at the same time to say that one would have a formal document drawn up with the full expectation that one would by consent insert in it a number of further terms. If that were the intention of the parties, then a bargain had been made, none the less that both parties felt quite sure that the formal document could comprise more than was contained in the preliminary bargain."
It seems to me that subject to the matters yet to be considered the present case falls into this fourth class as described in Sinclair, Scott & Co v Naughton .