Mavis Pugh appeared in two other "Are You Being Served?" episodes, "Take-over" and "The Club", both as different characters. In 1979, Pugh played Mrs Chase in the "Fawlty Towers" episode "The Kipper and the Corpse". Pugh had small parts in two films, "The Class of Miss MacMichael" in 1978 and "Brothers and Sisters" in 1980. Pugh appeared in two episodes of "Hi-de-Hi!" as The Hon. Winifred Dempster, the aunt of camp entertainments manager Clive Dempster - the 1986 episode "God Bless Our Family" (Series 8) and the 1988 episode "Wedding Bells" (Series 9). From 1987 to 1988, she played Mrs Barrable in
The Unicorn and the Wasp pseudohistorical episode "The Shakespeare Code". Roberts was given a fourth series episode to write after executive producer Russell T Davies reviewed Roberts' script for "The Shakespeare Code". Several months later, he received an email from the production team which said "Agatha Christie". The idea for a murder mystery featuring Agatha Christie came originally from producer Phil Collinson. Roberts, a self-confessed fan of Christie's works, made the episode into a comedy. Roberts based the episode on his favourite Christie works: "Crooked House", which focuses on secrets within an aristocratic society, and the 1982 film adaptation of "Evil Under the Sun". Speaking