(also 1959), playing the younger brother of Gabrielle (Audrey Hepburn). Also around that time, he had a leading role in an episode of the Sapphire/ITC series The Four Just Men ("The Man with the Golden Touch", 1959), as Neapolitan street urchin Pietro, who foils a robbery. Adult acting career In the early 1960s, O'Sullivan appeared in two Cliff Richard films: The Young Ones (1961), and Wonderful Life (1964). In the 1963 blockbuster Cleopatra, he appeared as Pharaoh Ptolemy XIII, the younger brother of the title character played by Elizabeth Taylor. For the remainder of the 1960s, O'Sullivan was a jobbing actor appearing in such TV series as Dr Syn: the Scarecrow, Emergency Ward 10, Redcap, Danger Man, No Hiding Place, Dixon of Dock Green and Strange Report among others, until he was offered the role of Lawrence Bingham in the LWT sitcom Doctor at Large (1971), a role which continued in the later Doctor in Charge (1972–73). Meanwhile, he also had a main role in the Thames Television comedy Alcock and Gander (1972) with Beryl Reid. By then a regular in TV sitcoms, he starred as Robin Tripp, a trainee chef, in the flatshare sitcom Man About the House written by Johnnie Mortimer and Brian Cooke, launched in 1973. In 1975, he starred in the stage comedy Boeing Boeing, undertaking two record-breaking national tours, alongside two of his Man About The House co-stars, Yootha Joyce and Sally Thomsett. When the television series ended in 1976, he continued playing Robin Tripp in the spin-off sitcom Robin's Nest, in which Robin sets up a bistro with funding from his girlfriend Vicky's father, James Nicholls (Tony Britton). During his run as Robin, he had relationships with two of his co-stars, Sally Thomsett from Man About the House, and Tessa Wyatt, who played Vicky in Robin's Nest. From the latter relationship, he had a son, Jamie. Robin's Nest was a big success, and was the first UK sitcom to feature an unmarried couple cohabiting. To tie in with the series, O'Sullivan wrote a recipe book called Man About the Kitchen, which was published in 1980. He also wrote the Robin's Nest theme tune, which was arranged by Brian Bennett. During that period, O'Sullivan also appeared in adverts for British Gas. In 1979, he starred in the title role of LWT's drama series Dick Turpin, which ran until 1982. He then played the widower Simon