When George and Mildred go to stay at her wealthy sister's house, the flatmates plan a party. Chrissy invites self-centred actor Mark (Ian Lavender), with whom she is infatuated, and Robin invites Liz (Jenny Hanley). Mark moves in on Liz, so Robin tries to seduce Chrissy. When George delights over his brother-in-law's conviction for drink driving, they are told to leave. They come home early and are invited to the party. Later, when moving his car, the breathalyser catches up with George.
Original Broadcast Date 9th January 1974