Leaving the army in 1918, Lloyd George found employment working with his father in the post war coalition government. This also included being a trustee for David Lloyd George's National Liberal Political Fund. Lloyd George was Liberal Member of Parliament for Pembrokeshire from 1922 to 1924 and again from 1929 to 1950. He was initially elected as a National Liberal but then joined the re-united Liberal Party in 1923. In 1931 Lloyd George initially took ministerial office as Parliamentary Secretary to the Board of Trade in the National Government of Ramsay Macdonald but resigned when his father David Lloyd George withdrew his support from the government. Gwilym Lloyd George was subsequently a member of the Independent Liberal group from 1931–1935 who were opposed to the continuation of the National Government. This group then subsequently returned to the main Liberal Party following the 1935 general election. In 1939 Lloyd George joined Neville Chamberlain's government for the same post he resigned from in 1931. From then on Lloyd George operated in effect as an independent Liberal. In 1941 he was appointed to the office of Parliamentary Secretary to the Ministry of Food and then Minister of Fuel and Power in 1942. Lloyd George stayed in the post until the 1945 general election It was after the death of his father in 1945 that Gwilym began hyphenating his surname as Lloyd-George.
Later political career, 1945 onwards
Following the 1945 general election in which he stood as a 'National Liberal and Conservative', and was returned by a majority of 168, Lloyd George was approached by the Liberal Party and its rival the Liberal National Party to chair their respective political organisations. Lloyd George turned them both down. Winston Churchill offered him a position in the Conservative Party's Shadow cabinet but was allowed to remain as a 'Liberal'. In 1946 Lloyd-George formally lost the Liberal Party whip. From this point onwards he did not associate with his erstwhile Libral colleagues for Newcastle upon Tyne North in the 1951 general election. His candidature was backed by Churchill although disgruntled Conservatives in the local party supported an independent against Lloyd George. Returning to office, Prime Minister Winston Churchill appointed him Minister of Food 1951–1954, and Home Secretary and Minister for Welsh Affairs from 1954 until his retirement in 1957. Lloyd-George was raised to the peerage as Viscount Tenby, of Bulford in the County of Pembroke. In 1955, during his time as Home Secretary, he had refused to commute the death sentence imposed on Ruth Ellis; she was the last woman to be executed in the UK.
Family
Lloyd George married Edna Gwenfron, daughter of David Jones, in 1921. They had two children: David Lloyd George, 2nd Viscount Tenby, and William Lloyd George, 3rd Viscount Tenby. He died aged 72, and was succeeded by his eldest son, David. Lady Tenby died in 1971.