For the former English footballer, see David Brett. David Brett is an English actor, singer and arranger. He was one of the original members of The Flying Pickets, and arranged a number of the group's songs, including the number one hit Only You. His work as an actor, mainly on stage, has included Lark Rise to Candleford at the Finborough Theatre, London, but he has also participated in a number of TV productions and played Dedalus Diggle in Harry Potter and the Philosopher's Stone.David appeared in Terry Pratchett's 'Guards, Guards' as Corporal Nobbs who was 'disqualified from the human race for pushing.'