Upon his return to England in 1951, Thomas resumed his work for the local newspaper group in north London where he had worked before his National Service, but within five years he was working for the
Exchange Telegraph news agency, now
Extel, and eventually with the
London Evening News newspaper, first as a sub-editor, later as a reporter. He stayed with the
Evening News until 1965, when he embarked full-time on his writing career. In 1984, Thomas published
In My Wildest Dreams recounting his childhood in South Wales, his days in Doctor Barnardo's homes in London, his National Service in the Far East, and his career in journalism. His novels about 1950s British
National Service such as
The Virgin Soldiers spawned two film versions, in 1969 and 1977, while his
Tropic of Ruislip and
Dangerous Davies, The Last Detective have been adapted for television (the former as
Tropic in 1979 and the latter having also spawned a film version, in 1981 and a TV series in 2003 with
Peter Davison). He was a subject of the television programme
This Is Your Life in 1979 when he was surprised by
Eamonn Andrews at a Barnardo’s hostel in Kingston, Surrey. His experiences as a
British Army conscript in the Far East during the height of the Malayan emergency were recalled when he appeared in the
BBC Radio 2 documentary
Caught in the Draft in 1985. He joined ex-RAF national serviceman
Bob Monkhouse and BBC Radio 2 drivetime presenter
John Dunn in a programme filled with reminiscences about their years in uniform. He was also featured in the short-lived
BBC One show
Time of My Life in 1983. The show was presented by
Noel Edmonds and Thomas was reunited with National Service colleague Reg Wilcock for the first time in 32 years. They duetted on "
Tumbling Tumbleweeds", a song they used to sing frequently at the Liberty Club in Singapore. Thomas was the subject of the first edition of BBC Wales' series
Great Welsh Writers, broadcast on BBC One Wales on 25 February 2013. ==Honours==