Sell wrote music for the
University of Bristol's revues in the early 1970s, leading to performances at the
Edinburgh Festival Fringe, where
Simon Brett saw Sell perform and offered him the pianist position on ''I'm Sorry I Haven't a Clue''. and remained on staff until at least April 2015. He occasionally provides live musical accompaniment for
The Comedy Store Players, a comedy improvisation group based in
The Comedy Store, London. He appeared in an episode of ''
Foyle's War'' as a pianist and composed the score for the 1984
BBC Television Shakespeare production of Shakespeare's
The Life and Death of King John. He has accompanied
Barry Cryer and
Willie Rushton in their stage show
Two Old Farts in the Night. After the interval he played (and sang) a solo: "We are the Boys in the Band". In 2013 he appeared with
Barry Cryer in
Richmond, Yorkshire, as part of the
Swaledale Festival, performing jazz and blues and songs of his own composition. He has arranged and directed music for radio plays such as
Born to be Wilde: An Ideal Husband in 2018. ==References==