Winston Churchill, 1951-1955; Anthony Eden, 1955-1957; Harold Macmillan, 1957-1963; Alec Douglas-Home, 1963-64; Harold Wilson, 1964-1970; Edward Heath, 1970-1974; Harold Wilson, 1974-1976 (secondo incarico); James Callaghan, 1976-1979; Margaret Thatcher, 1979-1990; John Major, 1990-1997; Tony Blair, 1997-2007; Gordon Brown 2007-2010; David Cameron, 2010-2016; Theresa May, 2016-2019; Boris Johnson, 2019-2022 e Liz Truss 2022.