Knowles is best known for his role as Captain Jonathan Ashwood, in the 1970s sitcom It Ain't Half Hot Mum (1974-81). He also played The Honourable Teddy Meldrum in the BBC comedy drama You Rang, M'Lord? (1988-93), and starred in the sitcom Come Back Mrs. Noah (1977-78).
Knowles also did the voice of the Head of the Air Force in The BFG for Cosgrove Hall. His television career started in 1969 with the role of Capt. Cutts in Dad's Army, a series which he later adapted (with Harold Snoad) for radio. With Snoad, he later wrote It Sticks Out Half a Mile, a radio sequel to Dad's Army. He is also credited as one of the writers for Are You Being Served.
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