A SUITABLE MARRIAGE is the fifth episode of the first season and the fifth episode overall of the 1970's Period Drama, Upstairs, Downstairs. The episode was written by Jeremy Paul and directed by Joan Kemp-Welch. It was one of six episodes from the first season that had been filmed in Black and White due to a Technicians strike that had paralyzed what is now ITV. This episode also marked the first appearance of Joan Benham in the recurring role of Lady Prudence Fairfax, who was a close friend of the Bellamy family.