Leon Brittan, Baron Brittan of Spennithorne, was a British Conservative politician and barrister who served as a European Commissioner from 1989 to 1999. As a member of Parliament from 1974 to 1988, he served several ministerial roles in Margaret Thatcher's government, including Home Secretary from 1983 to 1985.

The Chief Secretary to the Treasury is a ministerial office in the government of the United Kingdom and is the second most senior ministerial office in HM Treasury, after the Chancellor of the Exchequer. The office was created in 1961 to share the burden of representing HM Treasury with the chancellor.