After 1969, Campion's major career was as a restaurateur.
Gerald's mother Blanche Louise Bear was Charles Chaplin's first cousin. Her mother was Blanche Chaplin, Charlie Chaplin's aunt.
He was also a regular correspondent in the letters columns of London dailies and BBC radio's "Any Answers?".
Son of the scriptwriter Cyril Campion
Three children with first wife Jean: Anthea, Anthony and Angelica