He is best known for composing, writing and scoring the award-winning Jerry Springer: The Opera with book and additional lyrics co-written with Stewart Lee.
In 2000, he wrote and performed a one-act opera called Tourette's Diva with four actors, which aired at the Edinburgh Festival Fringe.
Thomas had the idea for an opera based on Jerry Springer at this time, and wrote it over the next two years, chiefly in workshops at Battersea Arts Centre.
Starting on 25 February 2007, BBC Two aired his series, Kombat Opera Presents..., comprising five standalone musical parodies of well-known television programmes.
Thomas wrote the libretto for Mark-Anthony Turnage's 2011 opera Anna Nicole,[3] and co-wrote music for the 2010 film Uncle David as a part of the Avant-Garde Alliance.