He is most famous for writing, directing and creating the multi award winning BBC/NBC Comedy drama series Dodger, a prequel to Oliver Twist and his roles in Star Stories, The Fast Show, Sirens and Nathan Barley.
Thomas began his TV career when he phoned the production company for Shooting Stars to ask for studio audience tickets.
In 1998 he starred in Shooting Stars and The Fast Show Live at the Hammersmith Apollo, the sketch show Barking for Channel 4 alongside Mackenzie Crook, Catherine Tate, Peter Kay and David Walliams and appeared at the Edinburgh Fringe Festival with Stay Alive Pepi.
He also appeared in Sir Bernard Chumley's Stately Homes and the pilot show Crazy Jonathan's with Matt Lucas and David Walliams.
Guest stars included Tom Baker, Paul Whitehouse, Charlie Higson, Bill Oddie, Christopher Cazenove, Phil Cornwell, Mitchell and Webb, Lucas and Walliams, Simon Day, Mark Williams, Anita Dobson, Art Malik and Dudley Sutton.
[6] Thomas has appeared in several other comedy series including Happiness, Monkey Trousers, Nathan Barley, the Channel 4 comedy Star Stories playing Jude Law, Andrew Ridgeley, Warren Beatty, Gary Glitter, Daniel Day-Lewis, Kiefer Sutherland and The Fonz amongst others.
He subsequently appeared on several panel shows and talking head programmes including Fanorama with David Mitchell (2001/2), Does Doug Know with Daisy Donovan on Channel 4 (2002), Law of the Playground (2006), Comedian's Comedian (2005), Nathan Barley (2005), 8 Out of 10 Cats (2006), FAQ U (2005), Charlie Brooker's Screenwipe (2006), Tittybangbang (2005) and Rob Brydon's Annually Retentive (2007).
It was launched and gained a positive critical reception with The Radio Times praising Thomas for his straight man role and the ability to make those around him seem even funnier.
When the project stalled, he turned his script and many elements into his Emmy award winning documentary The Great Pretender, released in September.
[11] In 2009 Thomas appeared in a mockumentary film Beyond the Pole starring with Stephen Mangan, Helen Baxendale and Mark Benton.
In April 2009, Thomas appeared in BBC switch's show, Winging it, playing the character of a music mogul, and wrote and starred in Above Their Stations, a sitcom pilot about Police Community Support Officers for BBC Three, also starring Simon Day, Dudley Sutton and Denis Lawson.
[citation needed] He is a member of the British show business charitable organisation the Grand Order of Water Rats.