Just Good Friends follows the wavering relationship between two ex-lovers, Penny Warrender, a secretary for an advertising firm, and Vincent Pinner, an ex-ice cream salesman turned turf-accountant (bookmaker) who is the son of a wealthy scrap-metal merchant.
The couple split up following Vincent's decision not to marry Penny on their wedding day, leaving her at the altar. In the pilot episode, 5 years since their intended wedding day, they meet again by chance in a pub while out on individual dates. They decide to forget the past and become friends, although the rekindling of their relationship is not welcomed by Penny's snobbish parents, particularly her mother Daphne.