He became interested in acting at a young age. By the age of 16, he had joined the Plymouth Repertory. In 1937, he briefly trained with the Royal Academy of Dramatic Art, but did not like it and soon joined the repertory company of John Gielgud. Among the plays he appeared in was Dear Octopus.
In 1938, he auditioned for and won the role for which he is perhaps best remembered, Ahmad in the 1940 version of The Thief of Bagdad, opposite Sabu. To do so he had to sign a seven-year contract with Alexander Korda.
He was given leave to work on two films, The Gentle Sex (1943) with Leslie Howard, and Journey Together (1944), an RAF feature film with a cast led by Richard Attenborough, Jack Watling and David Tomlinson; with a special appearance by the American film star, Edward G. Robinson. Silent film star Bessie Love also appeared in the cast.
With the war's end, Justin returned to acting. In 1948, he did a stint at the Shakespeare Memorial Theatre, Stratford-on-Avon, appearing in King John, The Merchant Of Venice, The Winter's Tale, Othello, Hamlet, and Troilus and Cressida. He also made the film Call of the Blood (1948).
In 1949, he appeared on stage in Peter Pan and was in Antigone on the BBC. Justin was in Return To Tyassi (1950) on the West End and appeared in The Angel with the Trumpet (1950).
Justin was married three times, first to Dancer and Choreographer Pola Nirenska. His second marriage, to Actress Barbara Murray, lasted from 1952 to 1964; they had three daughters. From 1970 to his death in 2002, he was married to Alison McMurdo.
He was in The Village (1953), a Swiss film; Melba (1953), a biopic; King of the Khyber Rifles (1954), a Hollywood film with Tyrone Power for 20th Century Fox; Seagulls Over Sorrento (1954) with Gene Kelly; The Teckman Mystery (1954) with Margaret Leighton; The Man Who Loved Redheads (1955) with Moira Shearer.
Fox called him back for Untamed (1955) and Warwick Films used him in Safari (1956) with Victor Mature. Justin had a good role in Fox's Island in the Sun (1957), romancing Dorothy Dandridge.
In 1957, he appeared on stage in Dinner With The Family. In 1959 he joined the Old Vic where his plays included The Double Dealer, As You Like It, and The Importance Of Being Earnest.
He made his Broadway debut in 1960 in the play Little Moon of Alban and was in The Spider's Web (1960). He was later in stage productions of Much Ado About Nothing (1963), Death of a Salesman (1965), and As You Like It (1965).
Between 1963 and 1970, he made no film appearances. In 1968, he played Thorin Oakenshield in the BBC Radio adaptation of The Hobbit.
On stage he was in Lulu (1971), toured South Africa in Who Killed Santa Claus? (1971), was in Old Fruit (1974), A Man And His Wife (1974)
Later films included Ken Russell's Savage Messiah (1972), Lisztomania (1975) and Valentino (1977).
In 1979, he played the ghoulish lover in the BBC's dramatisation of Le Fanu's Strange Incident in the Life of Schalcken the Painter, one of its Christmas ghost stories.
