Joan Benham appeared in sixteen episodes of Upstairs, Downstairs, from the first to the last series, as Bellamy family friend, Lady Prudence Fairfax. Other television programmes she appeared in include, Doctor in the House, Doctor in Charge, Father Brown, The Duchess of Duke Street, Doctor on the Go, Just william and Take My Wife. Her film credits include the Miss Marple movie Murder Ahoy! (1964), Ladies Who Do (1963), Perfect Friday (1970), and Carry On Emmannuelle (1978).