- Brother-in-law of Richard Attenborough, who was married to his sister Sheila Sim.
- Younger brother of actress Sheila Sim.
- Frequently cast as clergymen, doctors or magistrates.
- He appeared in seven films directed by his brother-in-law Richard Attenborough: Oh! What a Lovely War (1969), Young Winston (1972), A Bridge Too Far (1977), Gandhi (1982), Cry Freedom (1987), Chaplin (1992) and Shadowlands (1993).
- His character Colonel Sims in A Bridge Too Far (1977) was named after him.
- Uncle of director Michael Attenborough, Jane Attenborough and actress Charlotte Attenborough.
- In addition to appearing in seven films directed by his brother-in-law Richard Attenborough, he was also in nine films directed by Attenborough's close friend and former producing partner, Bryan Forbes.
- He appeared in two films with his niece Charlotte Attenborough: Whistle Down the Wind (1961) and Oh! What a Lovely War (1969).
- He was considered for the role of the Pathologist in Lifeforce (1985).
- He was the great-uncle of Tom Attenborough.
- Resembles fellow British actor Alexander Knox.
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