After leaving school, John Leeson worked in a bookshop, and then as a
porter in the Leicester Royal Infirmary Hospital. He joined the
Leicester Dramatic Society and ultimately applied for and won a place
at the Royal Academy of Dramatic Art. On leaving RADA, he worked in
repertory and pantomimes, including "Toad of Toad Hall," in which he
met his future wife. His first work in television was as a walk-on in a
BBC play,
The Wedding Feast (1965).
The Spanish Farm (1968),
Dad's Army (1968)
and numerous situation comedies followed. He played the original Bungle
the bear in the children's series
Rainbow (1972), set questions for
Mastermind (1972) and did a lot of freelance voice work for the BBC. He was cast in
Doctor Who (1963), providing the voice of K-9, the robot dog companion of
Tom Baker's Fourth Doctor, after he bumped into director
Derrick Goodwin, with whom he had worked previously, in a pub. Since his time in the series, Leeson has continued to act and provide voiceover services for
the BBC and many other companies. In 1995 he appeared in the Doctor
Who spin-off video drama
Downtime (1995), playing a disc jockey.