Roger Gareth Thomas was a British Labour Party politician.He was born at Garnant, Carmarthenshire, on 14 November 1925, the son of Evan J. Thomas, a coalminer who later became a baker, and Beryl Thomas. The family was Welsh-speaking and left-wing. Thomas inherited a fierce anti-Conservative standpoint which remained with him throughout his life. He received his education at Ammanford Grammar School, and the London Hospital Medical School. He qualified as a medical practitioner in 1948 just as the National Health Service was beginning. He served as a captain in the Royal Army Medical Corps, 1949–52, a period during which he saw service in west Africa. He returned to south Wales to practise as a family doctor in the Cross Hands area between Port Talbot and Carmarthen in 1952, serving the local community there for more than forty years.He joined the Labour Party in 1970, securing election as the Labour member for the Saron ward on the Dyfed County Council where he served from 1977 until 1979.In 1979, Thomas was elected Member of Parliament for Carmarthen, defeating the President of Plaid Cymru, Gwynfor Evans. It was one of only two Labour gains throughout the whole of Great Britain in that general election which saw Margaret Thatcher and the Conservatives sweep to power at Westminster. He continued to represent the constituency until his resignation in 1987, having successfully fought off a powerful challenge from the Conservatives in the person of Nigel Thomas in the June 1983 general election. A member of the Fabian Society, he was appointed a member of the Select Committee on Welsh Affairs in 1979 and he was also opposition spokesman on Welsh Affairs.