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Undue influence in English law is a field of contract law and property law whereby a transaction may be set aside if it was procured by the influence exerted by one person on another, such that the transaction cannot "fairly be treated the expression of free will".
Historically the doctrine had predominantly been invoked where the person who is exercising undue influence over another person either enters into a contract with the affected person or receives a gift from them. However, much of the recent case law relates to three party cases, where one person exerts undue influence on a second person to enter into a transaction with a third party. The doctrine originally developed because of perceived limitations in the law relating to duress. Although the modern law is different, previously in order to set aside a contract for duress it was necessary to show a threat of violence to the person , and the doctrine developed in response to more subtle forms of coercion. Accordingly, many earlier cases which refer to undue influence are capable of being reconsidered as actually relating to duress or unconscionable bargains in the modern sense.
The leading authority on undue influence is now the decision of the House of Lords in Royal Bank of Scotland v Etridge However much of the earlier case law continues to be relevant. There has been no real statutory intervention in this area of the law. Despite the wide array of cases considering the doctrine, there remains some disagreement as to the precise ambit of the doctrine.