Harold Wilson
James Harold Wilson, Baron Wilson of Rievaulx, (11 March 1916– 24 May 1995) was a British Labour politician who served as Prime Minister of the United Kingdom from 1964 to 1970 and 1974 to 1976.
Barbara Castle
Labour returned to government under Harold Wilson in October 1964 following a general election, defeating Alec Douglas-Home's Conservative government by winning a slim majority of four seats, thus ending 13 years of successive Conservative governments. Wilson had selected his core Cabinet four months prior to the election; Castle knew Wilson intended to place her within his Cabinet, which would make her the fourth woman in British history ever to hold position in a Cabinet, after Margaret Bondfield, Ellen Wilkinson and Florence Horsbrugh.