James Callaghan

Leonard James Callaghan, Baron Callaghan of Cardiff,, often known as Jim Callaghan, served as Prime Minister of the United Kingdom from 1976 to 1979 and Leader of the Labour Party from 1976 to 1980. Callaghan is, to date, the only British politician to have served in all four of the Great Offices of State, having been Chancellor of the Exchequer (1964–1967), Home Secretary (1967–1970), and Foreign Secretary (1974–1976) prior to his appointment as Prime Minister. As Prime Minister, he had some successes, but is mainly remembered for the "Winter of Discontent" of 1978–79. During a very cold winter, his battle with trade unions led to massive strikes that seriously inconvenienced the public, leading to his defeat in the polls by Conservative leader Margaret Thatcher.