On film, he appeared in The Adventures of Quentin Durward (1955, as the villain De La Marck), The 39 Steps (1959, as Kennedy), Ben-Hur (1959, as Marius, an associate of Messala), Mutiny on the Bounty (1962, as John Williams), Arabesque (1966, as Kyle Webster) and Battle of Britain (1969, as Flight Sergeant Arthur). Lamont is particularly memorable in his role as the wry, urbane Viceroy in Jean Renoir's The Golden Coach (1952).
