John Diamond, Baron Diamond

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John Diamond, Baron Diamond PC (30 April 1907, Leeds – 3 April 2004, Chalfont St Giles), also known as "Jack Diamond", was a British Labour Party politician.

Diamond was educated at Leeds Grammar School and became an accountant. He was elected Member of Parliament in 1945 for the Blackley division of Manchester, but lost it in 1951. In 1946 and 1947, he was parliamentary private secretary to the Ministry of Works. He returned to the House of Commons in a 1957 by-election for Gloucester, caused by the death of its Labour MP, Moss Turner-Samuels.

He served as Chief Secretary to the Treasury from 1964, a cabinet position from 1968, and Privy Councillor from 1965. He represented Gloucester until his surprise defeat in 1970 by the Conservative candidate, Sally Oppenheim-Barnes.

Diamond was appointed to the Privy Council in the 1965 Birthday Honours,[1] and was made a life peer as Baron Diamond of the City of Gloucester on 25 September 1970. In 1981 he left the Labour Party for the new Social Democratic Party. He led the SDP in the House of Lords from 1982 to 1988 but opposed its merger with the Liberals and rejoined Labour in 1995.


Diamond was first married in 1932 and had two sons and a daughter. He had a daughter, Joan, by his second wife, Julie Goodman, whom he married in 1948. They separated in 1966 and divorced 10 years later. Upon his death at 96, he was survived by his children and by his third wife, Barbara Kagan, whom he had married in 1976.


  1. The London Gazette: (Supplement) no. 43667. p. 5471. 4 June 1965. Retrieved 3 January 2015.

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Parliament of the United Kingdom
Preceded by
John Lees-Jones
Member of Parliament for Manchester Blackley
Succeeded by
Eric Johnson
Preceded by
Moss Turner-Samuels
Member of Parliament for Gloucester
Succeeded by
Sally Oppenheim
Political offices
Preceded by
John Boyd-Carpenter
Chief Secretary to the Treasury
Succeeded by
Maurice Macmillan
Party political offices
Preceded by
New position
Leader of the Social Democratic Party in the House of Lords
Succeeded by
The Lord Jenkins of Hillhead
Leader of the SLD in the House of Lords
The Baroness Stedman
Leader of the continuing SDP in the House of Lords