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
Thatcher Peninsula the Royal Geographical Society, after Margaret Thatcher, British prime minister, 1979–90. She was described by Sir Vivian Fuchs, chair of the Foreign Office's Antarctic Place Names Committee, as 'a major figure in the history of South Georgia', for her role in the Falklands War: 'The geographical tribute appropriately encompasses the spot where the first troops from the Task Force landed in April 1982.' Thatcher was, according to friends, 'flattered and amused' by the honour. Thatcher Peninsula Thatcher Peninsula () is a mountainous peninsula in north-central South Georgia terminating to the north in Mai Point, rising between Cumberland West Bay to