Anthony Valentine was an English actor best known for his television roles: the ruthless Toby Meres in Callan (1967–72), the sadistic Major Horst Mohn in Colditz (1972–74), Bob in Tales of the Unexpected, the suave titular gentleman thief in Raffles (1977), and the murderous Baron Gruner in the Sherlock Holmes episode "The Illustrious Client" (1991).

Callan is a British action-drama spy television series created by James Mitchell, first airing between 1967 and 1972. It starred Edward Woodward as David Callan, an agent of a state secret service dealing with internal security threats to the United Kingdom. Though portrayed as having responsibilities similar to those of the real-life MI5, Callan's fictional "Section" has carte blanche to use the most ruthless of methods. In the storylines interrogation is by means of torture, while extrajudicial killings are so routine they have a colour-coded filing system. Despite being an assassin who stays in the socially isolating job because it is the only thing he is good at, Callan is a sympathetic character by comparison to his sadistic upper-class colleagues and implacable superiors. The downbeat cover for the Section's headquarters was the scrap metal business of "Charlie Hunter". Produced by ABC Weekend TV and Thames Television, the programme proved extremely popular; as well as four series between 1967 and 1972 there was a feature-length film in 1974 and a TV film in 1981.