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In page Scottish independence:

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In protest, the SNP withdrew their support from the government. A motion of no confidence was then tabled by the Conservatives and supported by the SNP, the Liberals and Ulster Unionists. It passed by one vote on 28 March 1979, forcing the May 1979 general election, which was won by the Conservatives led by Margaret Thatcher. Prime Minister Callaghan described the decision of the SNP to bring down the Labour government as "turkeys voting for Christmas".[8][9] The SNP group was reduced from 11 MPs to 2 at the 1979 general election, while devolution was opposed by the Conservative governments led by Margaret Thatcher and John Major.