- He is an Associate Member of RADA.
- Was among those actors to be offered the part of "Kane" (Edward Peel) in Doctor Who (1963): Dragonfire, but he was not free to accept the role.
- Daughter Kate Alderton, with Pauline Collins.
- Considered for Col. Colin Caine, Dr. Armstrong, Roger Derebridge and Kelly in Lifeforce (1985).
- He was awarded Top Actor Award in the Sun Awards in 1973.
- John was educated at Kingston High School in Hull where he played cricket for the school team and regularly performed in the school plays.
- Born on the same day as Bruce Lee.
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