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.
He is possibly best known for his role in the sitcom George and Mildred (1976–79) as the snobbish, right-wing real estate agent Jeffrey Fourmile, the foil to George.
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