David is a man of many accents not just English (RP) and American - you can listen to his excellent Brummie (Birmingham) accent in the 2003 Radio 4 production of The Rotter's Club. David played three roles, Bill Anderton, Malcolm and Fudge.
The play was transmitted in four 30 minute episodes and starred James Bradshaw and Frank Skinner and also featured David Troughton who appears in the Midnight episode of Doctor Who and he is also the son of Patrick Troughton, the 2nd Doctor.