Under the terms of the Act, it could then be repealed by a Statutory Instrument to be approved by Parliament. The government's decision to abandon devolution led the SNP to withdraw its support for the Labour government. It was in a minority in Parliament and had relied on deals with the smaller parties, including the SNP, for its survival. After establishing that the Liberals and the SNP would vote against the government in a confidence motion, the Conservative opposition tabled a motion on 28 March. The government was defeated by one vote, and a UK general election was subsequently called. This was won by the Conservatives, and Parliament voted to repeal the Act on 20 June 1979.