Career
During World World War II, Gardner served in the Royal Air Force as an air gunner with Number. 10 Squadron. His first film appearance was in The Curse of the Mummy"s Tomb released during 1964. Thereafter he appeared in over 30 films and also made extensive television and theatre appearances.
Some of his best known Shakespearean roles such as Adam in As You Like lieutenant, and Gravedigger in Hamlet were performed under the direction of Terry Hands.
He played Knight Business driver Ernie Prang in Harry Potter and the Prisoner of Azkaban, the third film in the Harry Potter film series.