Cooke also wrote and created the 1980s TV sitcom Keep It in the Family, starring Robert Gillespie and the 1960s sitcom Father, Dear Father starring Patrick Cargill.
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They also wrote the screenplays for the film version of the play No Sex Please, We're British, and the movie versions of their series' Man About the House and Father Dear Father.
He started out as a cartoonist, which brought him into contact with his writing partner Brian Cooke.
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When the series concluded in 1976, series producers Brian Cooke and Johnnie Mortimer devised two spin-offs of the series.
Mortimer later wrote series for radio such as Men from the Ministry and Round the Horne, before writing many TV situation comedies including Foreign Affairs, Man About the House, Never the Twain, Robin's Nest and George and Mildred, often working in partnership with Brian Cooke.