'That Beryl Marston' is set in sunny Brighton. Georgie (Julia McKenzie) and Gerry Bodley (the late Gareth Hunt) run a curio shop near the seafront. They are successful in business but not in married life. They still live together, but the marriage has been blighted by Gerry's torrid affair with Beryl Marston, the local bike.
Beryl is never actually seen, just glimpsed from time to time and her silhouette is in the opening credits.
The Bodleys have two children: Jane (Jayne Stevens) and Phil (Jonathan Morris, later to play 'Adrian' in Carla Lane's 'Bread') who addresses the audience, commenting on events a la Frankie Howerd in 'Up Pompeii!'.
Peter John played the Bodleys' gay friend 'Harvey'.