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 Thatcher did not devote herself entirely to studying chemistry as she only intended to be a chemist for a short period of time. Even while working on the subject, she was already thinking towards law and politics. She was reportedly prouder of becoming the first Prime Minister with a science degree than becoming the first woman, and as Prime Minister attempted to preserve Somerville as a women's college. During her time at Oxford, she was noted for her isolated and serious attitude. Her first boyfriend, (1926–2014), recalled that she was "very thoughtful and a very good conversationalist. That's probably what