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Sallis acted alongside Roger Moore and Tony Curtis in an episode of "The Persuaders!" ("The Long Goodbye", 1971). He appeared in many British films of the 1960s and 1970s including "Saturday Night and Sunday Morning" (1960), "Doctor in Love" (1960), "The Curse of the Werewolf" (1961), "The V.I.P.s" (1963), "Charlie Bubbles" (1967), "Scream and Scream Again" (1969), "Taste the Blood of Dracula", "Wuthering Heights" (1970), "The Incredible Sarah" (1976) and "Who Is Killing the Great Chefs of Europe?" (1978). Additionally in 1968, he was cast as the well-intentioned Coker in a BBC Radio production of John Wyndham's "The Day of the Triffids".