Third Thatcher ministry to make way for a leader more likely to win the next general election. Her successor was the Chancellor of the Exchequer John Major, who was elected on 27 November 1990, and who at 47 became the youngest Conservative Prime Minister of the 20th century. <section begin="June 1987 to July 1989" /> <section begin="July 1989 to November 1990" /> Members of the Cabinet are in bold face. Third Thatcher ministry Margaret Thatcher was Prime Minister of the United Kingdom from 4 May 1979 to 28 November 1990, during which time she led a Conservative government. She was the first woman
Premiership of Margaret Thatcher second ballot to Heseltine. On 22 November, at just after 9.30 am, she announced to the Cabinet that she would not be a candidate in the second ballot after all. Shortly afterwards, her staff made public what was, in effect, her resignation statement, in which she stated that she had "concluded that the unity of the Party and the prospects of victory in a General Election would be better served" if she stood down as Prime Minister. Neil Kinnock, Leader of the Opposition, proposed a motion of no confidence in the Government, and Margaret Thatcher seized the opportunity this presented