Across his career as a jockey, Thomas won 509 races and earnt £5.59 million prize money in Great Britain and a further €255,815 in the Republic of Ireland.
[4][5] Thomas joined Venetia Williams yard and by 20 he had ridden out his claim,[6] and saw success with Limerick Boy winning the 2004 Lanzarote Hurdle at Kempton Park[7] and a Summer Cup at Uttoxeter Racecourse with Kock De La Vesvre.
The biggest race win of his career came in 2008, taking victory in the Cheltenham Gold Cup with Denman beating stablemate Kauto Star.
[12][13] Continuing to ride Nicholls' top runners, he fell at the last fence in the Betfair Chase on Kauto Star,[14] and again in the Hennessy Gold Cup at Newbury Racecourse on Big Buck's.
[16] In 2017 he returned to the saddle for a charity race in aid of Bob Champion at Chepstow Racecourse, winning on Maoi Chinn Tire.