Which Act of parliament provides that collective agreements are presumed not to have been intended by the parties to be legally enforceable (except for legally binding agreements in writing)?

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The Act provides that collective agreements are conclusively presumed not to have been intended by the parties to be legally enforceable. The only exception is where the agreement is in writing and expressly stated to be legally enforceable. Stone 4.5

Which Act of Parliament Provides That Collective Agreements Are Presumed