After appearing in repertory theatre, Child was cast in a significant role in the 1967 film Privilege. Since then he has played over 90 different roles in films and television, including a small role in the cult film Quadrophenia; as Piers Leigh in the miniseries Edward & Mrs. Simpson; as one of the main villains in Bird of Prey; as Tory Politician Charles Gurney Seymour in the television adaptation of Jeffrey Archer's First Among Equals, and a cameo in A Fish Called Wanda. From 1977-78, he appeared in the second series of Backs to the Land.