Tales of the Unexpected was a British anthology series based (for the first few years, anyway) on the short stories of Roald Dahl, taken from his collections, Tales of the Unexpected, Someone Like You, and Kiss, Kiss. Dahl introduced the stories himself, a format he would also use in his short-lived US series Way Out.
Here's an episode from April 26, 1980, during the show's second season, "Georgy Porgy." Directed by Graham Evans and adapted by Robin Chapman, it tells the story of George Duckworth (played by John Alderton), a vicar who likes to imagine all his female parishioners naked, until lovely Julia Roach (played by lovely Joan Collins) comes to his parish. Julia, unfortunately for George, is what is sometimes referred to as a maneater...
Enjoy this episode, one of the most unexpected of the Unexpected.