On this day, November 22, in 1990, Margaret Thatcher announced her resignation. The first woman prime minister in British history was elected in 1979 and was the longest-serving British PM of the 20th century.

Thatcher was photographed at the House of Commons, Westminster, in 1974 when she was Leader of the Opposition, one of many sittings arranged through Tom Blau of Camera Press. See some others.