Butskellism is an initially satirical term used for the emerging ideology formally known as the Post-War Consensus in the . It takes the form of a truce between different classes in society widely perceived to be to the benefit of the greater good, involving Keynesian economic policy, a powerful and growing welfare state and economic intervention and regulation, particularly in the United Kingdom, its successor state the Federated Kingdom of Great Britain and the Isles, and in the British Commonwealth. It later became the more clearly articulated ideology of the British Unionist Party in opposition to the Federalist Party, and of other parties in the Commonwealth nations.
Margaret Thatcher attempted to pursue a policy directly opposed to all principles of Buskellism after her election in 1979. This proved to be unpopular and led to a landslide for Labour in the 1984 election, and since then, no party has been courageous enough to try breaking it. This ultimately resulted in the merging of the two main post-war English political parties into the British Unionist Party.