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Williams v Roffey Bros [1991] 1 QB 1 TOP

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A controversial Court of Appeal decision of 1990 which seemed to abolish the requirement that any variation to an existing contract needs to be supported by fresh consideration. The sub contractors were able to enforce a promise to pay extra if work was completed on time under an existing contract. They were said to have provided practical benefit to the defendants. Has since been doubted in relation to debt obligations by another Court of Appeal.