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
Margaret Thatcher past 70 years. Despite a relatively poor average poll rating as Prime Minister, Thatcher has since ranked highly in retrospective opinion polling and, according to YouGov, she is "see[n] in overall positive terms" by the British public. She was voted the fourth-greatest British prime minister of the 20th century in a poll of 139 academics organised by MORI. According to theatre critic Michael Billington, Thatcher left an "emphatic mark" on the arts while Prime Minister. One of the earliest satires of Thatcher as Prime Minister involved satirist John Wells (as writer and performer), actress Janet Brown (voicing Thatcher) and future