According to his own mini-biography, after leaving King Edward VI School Stratford-upon-Avon Tremlett worked for the Coventry Evening Telegraph from 1957 as a TV columnist and pop music reviewer. In 1961 he became a freelance rock journalist and in the 1970s he wrote a series of superficial paperback pop books, including The David Bowie Story, the first biography about the musician.
He is a biographer of Dylan Thomas and his wife Caitlin. He interviewed Caitlin at her home in Catania for the book Caitlin: Life with Dylan Thomas (New York, 1987). He has argued that Thomas was "the first rock star." In 1997 he published a book with James Nashold, The Death of Dylan Thomas, that claimed that Dylan Thomas' death was not due to alcohol poisoning but rather a mistake by Thomas' physician in prescribing cortisone, morphine and benzedrine when Thomas was actually in a diabetic coma.
Tremlett runs the Corran Bookshop in Laugharne, "a shrine to the poet", after moving to the town in 1982. The shop also offers tourist information and was nominated for the Carmarthenshire Business Awards in 2005.
He was a Conservative member for Twickenham on the Greater London Council. He served as head of Housing Policy under Horace Cutler and was Deputy Leader at one time. He opposed its abolition against the view of his own party, and was forced to resign from the GLC group owing to this disagreement. Tremlett wrote in the Morning Star that "During her first premiership, Mrs. Thatcher became obsessed with Ken Livingstone; she regarded him as a danger to the state. It was she who committed the Conservative Party to the abolition of the GLC by personally writing that commitment into the general election manifesto." His work as head of housing policy was profiled in the sixth episode of the first BBC series The Secret History of Our Streets (Arnold Circus).
- "Birthdays". The Guardian (Guardian News & Media). 5 Sep 2014. p. 39.
- Biography - Tremlett, George (William) (1939-). Contemporary Authors. Thomson Gale.
- "George Tremlett". Good Reads. Retrieved 1 May 2011.
- Morley, Paul (18 July 2004). "The 10 books for the beach". The Observer. Retrieved 1 May 2011.
- Calder, Jonathan (8 December 2008). "Stalin's lovechild". New Statesman. Retrieved 1 May 2011.
- Pegg, Nicholas (2006). The Complete David Bowie. Reynolds & Hearn. p. 413. ISBN 1-905287-15-1.
- Middleton, Christopher (28 June 2003). "The write stuff: Dylan Thomas's Swansea". Daily Telegraph. Retrieved 1 May 2011.
- The Listener: Volume 118, Issues 3018-3043. British Broadcasting Corporation - 1987
- Smith, Jacob (2011). Spoken Word: Postwar American Phonograph Cultures. University of California Press. p. 222. ISBN 0-520-26704-4.
- "People: Dylan Thomas finds poetic justice at last". The Independent. 13 October 1997. Retrieved 1 May 2011.
- "Dylan Thomas's village, Laugharne, Carmarthenshire". The Guardian. 6 June 2009. Retrieved 1 May 2011.
- Atkinson, David (15 June 2008). "Follow in the footsteps of Dylan Thomas". The Observer. Retrieved 1 May 2011.
- "Tourist information from experts". Carmarthenshire County Council. 23 March 2005. Retrieved 1 May 2011.
- The London journal, Volumes 9-12, p.67 Maney Publishing, Longman, 1983
- Electoral History of the Greater London Council
- "Local Government (Interim Provisions) Bill HC Deb 11 April 1984 vol 58 cc402-84, 460". Hansard. 11 April 1984. Retrieved 1 May 2011.
- Off with its head. The Economist, Volume 291, 1984, p66
- The Town planning review, Volume 51. Dept. of Civic Design, Liverpool School of Architecture. Liverpool University Press, 1980
- The Economist: Volume 272, Issues 7088-7100. 1979