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
Historical rankings of Prime Ministers of the United Kingdom prime ministers were ranked in the top 100. Winston Churchill was voted greatest Briton, the Duke of Wellington was in 15th place (though not featured in contemporary polls as he was a 19th-century politician), Margaret Thatcher was in 16th place, Tony Blair was 67th and David Lloyd George was 79th. The BBC television programme "The Daily Politics" asked viewers in 2007 to select their favourite Prime Minister. Margaret Thatcher topped the list with 49% of the vote, with Clement Attlee coming second with 32%. Historical rankings of Prime Ministers of the United Kingdom "The Times" constructed a poll for the