Devereaux's first wife was Irene Champion. Together they had four children: John (b. 1954), Steven (b. 1955), Timothy (b. 1956) and Matthew (b. 1962). Champion wrote the song for the Skippy spin-off film The Intruders in 1969. She and Devereaux separated in 1986.
Devereaux appeared as Mr. Gubbins in the 1963 British comedy film Ladies Who Do and in several Carry On films including Carry On Sergeant, Carry On Nurse, Carry On Regardless and Carry On Jack.
He also appeared as Thomas Macaulay in series 5 of The Onedin Line, as Lord Beaverbrook in both Edward & Mrs. Simpson and The Life and Times of David Lloyd George, and as Mac in the British comedy series Absolutely Fabulous and in The Professionals (episode "Runner") and The Sweeney ("Jackpot"). In 1964 he appeared in The Saint episode "The Loving Brothers". In 1970 he played the villain in The Persuaders ! episode "Anyone Can Play".
Australian TV roles included the title role of Jack Meredith in My Brother Jack (ABC-TV, 1965), and George King in Kings (1983). He also received critical acclaim for his role as Australian Prime Minister Ben Chifley, in the ABC-TV mini series The True Believers (1988).
Three months after he was diagnosed with cancer of the oesophagus, Devereaux died in his sleep of renal failure at his Hampstead home on 17 December 2003 at the age of 78. He had insisted on being released from Royal Free Hospital to be at home with Julie, his third wife of 17 years. He was cremated at the Golders Green Crematorium, where his ashes remain.
