|Sir Keith Joseph
Following the Tories' 1974 election defeat, Keith Joseph stepped aside to allow Margaret Thatcher to become party leader. He was given responsibility for policy before being appointed trade secretary in 1979.
Seen as the intellectual driving force of Thatcherism, he was dubbed "the mad monk" by opponents. By 1981, he had moved to education, paving the way for GCSEs and the national curriculum.
He left the cabinet in 1986 and stepped down as an MP after the 1987 General Election. He became a life peer, Baron Joseph of Portsoken, in the dissolution honours list. He died aged 76 in December 1994.