Liz Truss – shortest-serving UK PM Liz Truss has dramatically resigned as the British prime minister after just 45 days in office, but says she will stay on until a successor is chosen, by October 28 Liz Truss announces resignation SHORTEST-SERVING UK PRIME MINISTERS (since 20th century) Conservative Labour Liberal Boris Johnson 2019-22 Conservative 3 years 44 days James Callaghan 1976-79 Labour 3 years 29 days Theresa May 2016-19 3 years 11 days Neville Chamberlain 1937-40 2 years 348 days Gordon Brown 2007-10 2 years 318 days Sir Henry Campbell-Bannerman 1905-08 2 years 122 days Sir Anthony Eden 1955-57 1 year 279 days Sir Alec Douglas-Home 211 days (1922-23) Andrew Bonar Law 363 days (1963-64) Liz Truss 45 days (to resignation – Oct 20, 2022) Sources: BBC News, UK Government Picture: Getty Images © GRAPHIC NEWS