While he is best known as the body of Darth Vader his career included A Clockwork Orange
[embedyt] https://www.youtube.com/watch?v=NIJ6Ymv0MtY[/embedyt]
He was also faced off against Jon Pertwee’s Doctor in the Time Monster
His second most famous role was that of the Green Cross Code Man
Which he reprised in the 21st century
As he was silent for most parts, here is a video of a 1980 interview
https://www.youtube.com/watch?v=O6AxQyBsbu8&t=113s