Britain By HistoryTWO 1900 Elected Conservative MP for Oldham Period: 1900 to 1904 Concervative Party Member 1904 Defected to Liberal Party Period: 1904 to 1924 Liberal Party Member 1911 Became 1st Lord of the Admiralty Period: 1915 to 1916 Gallipoli Campaign Period: 1924 to 1965 Conservative Party Member Period: 1929 to 1939 The Wilderness Years Period: 1940 to 1945 PM Period: 1951 to 1955 PM