In 1990, Mantle had a small role as an electricity meter reader in the One Foot in the Grave episode "The Return of the Speckled Band", and played Harry, a man who "gave Clint Eastwood a pounding" in White Hunter Black Heart.
In 1990, John Mantle had a minor role as an electricity meter reader in the television show "One Foot in the Grave" episode titled "The Return of the Speckled Band", and played Harry, a character who physically assaulted Clint Eastwood in the film "White Hunter Black Heart".