Films
* The Wild Geese (1978) - He played the memorable role of "The Major" in this action-adventure film starring Richard Burton.
* The Mirror Crack'd (1980) - He starred as "Mark" in this Agatha Christie adaptation.
* The Human Factor (1979) - He played the role of "Dr. Davy" in this thriller film.
* The Jewel of the Nile (1985) - He had a supporting role as "Colonel John Adamthwaite" in this action-comedy sequel to "Romancing the Stone".
* The Deceivers (1988) - He played "Major William Gordon" in this historical drama.
* The Secret of NIMH (1982) - He voiced the character of "Justin" in this animated film.
Television
* The Professionals (1977-1983) - He played the role of "George Cowley" in this popular British action series.
* The Jewel in the Crown (1984) - He portrayed "Ronald Merrick" in this acclaimed miniseries.
* The Adventures of Sherlock Holmes (1984-1991) - He had a recurring role as "Mycroft Holmes" in this series.
* The Chief (1990-1993) - He starred as "Chief Superintendent John Cowley" in this British crime drama.
* Miss Marple (1984-1992) - He appeared in multiple episodes as different characters.
* Poirot (1989-2013) - He played various roles in the long-running Agatha Christie adaptation.
This is just a sample of his diverse filmography. He has also appeared in numerous other films, television series, and stage productions throughout his career.