What is the test for pleading that there are implied terms or oral amendments to a contract?

Where a party pleads that there are implied terms or oral amendments on which they are entitled to rely, then, as stated by C. Campbell J. in Beaucage v. Grand & Toy Ltd.(supra): The defence is entitled to know before pleading (a) what are the implied terms of the contract relied on; (b) what oral amendments are being relied on; (c) when the implied terms arose, whether before or after execution; (d) the circumstances of the oral amendments, i.e., who said what to whom with binding authority and what, if any, substantiation is there for these oral amendments. The next step requires the plaintiffs to set out in sufficient detail that the defence can plead the specifics of the breach of the expressed, implied or oral terms, when they occurred and to which of the plaintiffs each breach is applicable. Breach of the Duty to Act in Good Faith: