- Was offered the role of the fourth Doctor in the BBC series Docteur Who (1963) after the departure of Jon Pertwee, but he didn't want to commit himself to one role. He would later play the villain Soldeed in the 17th season serial "The Horns of Nimon".
- He has performed with the National Theatre.
- He is the father of Sarah Crowden.
- Has acted in both the Eon James Bond franchise and The Doctor Who franchise.
- Considered for the roles of Dr. Hans Fallada, Dr. Armstrong and Sir Percy Heseltine in Lifeforce - L'étoile du mal (1985).
- Appeared with Blythe Duff in The Isle of Voices, a 27 minute short which was screened at the Edinburgh Film Festival in 1994/95.
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