The Labour Party governed the United Kingdom of Great Britain and Northern Ireland from 1974 to 1979. During this period, Harold Wilson and James Callaghan were successively appointed as Prime Minister by Queen Elizabeth II. The end of the Callaghan ministry was presaged by the Winter of Discontent, a period of serious industrial discontent. This was followed by the election of Conservative leader Margaret Thatcher in 1979.

Margaret Hilda Thatcher, Baroness Thatcher, was a British stateswoman and Conservative politician who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold the position. As prime minister, she implemented economic policies known as Thatcherism. A Soviet journalist dubbed her the "Iron Lady", a nickname that became associated with her uncompromising politics and leadership style.