Contract (Scotland) Act 1997 (c. 34)

(1) Where a document appears (or two or more documents appear) to comprise all the express terms of a contract or unilateral voluntary obligation, it shall be presumed, unless the contrary is proved, that the document does (or the documents do) comprise all the express terms of the contract or unilateral voluntary obligation. (2) Extrinsic oral or documentary evidence shall be admissible to prove, for the purposes of subsection (1) above, that the contract or unilateral voluntary obligation includes additional express terms (whether or not written terms). (3) Notwithstanding the foregoing provisions of this section, where one of the terms in the document (or in the documents) is to the effect that the document does (or the documents do) comprise all the express terms of the contract or unilateral voluntary obligation, that term shall be conclusive in the matter. (4) This section is without prejudice to any enactment which makes provision as respects the constitution, or formalities of execution, of a contract or unilateral voluntary obligation.

(1) Where a deed is executed in implement, or purportedly in implement, of a contract, an unimplemented, or otherwise unfulfilled, term of the contract shall not be taken to be superseded by virtue only of that execution or of the delivery and acceptance of the deed. (2) Subsection (1) above is without prejudice to any agreement which the parties to a contract may reach (whether or not an agreement incorporated into the contract) as to supersession of the contract.