28th March 1979: British Prime Minister James Callaghan loses a vote of no confidence by a single vote

By early 1979 Callaghan’s government had lost its majority in the House of Commons and, with the government weakened, the Conservative Party, led by Margaret Thatcher, tabled a motion of no confidence.

14th November 1990: Margaret Thatcher faces leadership challenge

On the 14th November 1990, Margaret Thatcher’s fifteen year leadership of the British Conservative Party was challenged by Michael Heseltine, a former cabinet minister.