- Turned down the chance to play James Bond in Live and Let Die (1973).
- Was originally cast to play the part of Kane in Alien (1979), but had to drop out on the first day of filming because he fell ill with bronchitis, forcing him to spend three days in intensive care.
- During the making of Diagnosis: Murder (1974), he fainted several times on the set, and was diagnosed with diabetes. This may have been why he had to drop out due to illness on the first day of filming the sci-fi horror film Alien (1979). Jon was replaced by John Hurt.
- He was chosen, somewhat incongruously, to play the Aboriginal Detective Inspector Bonaparte in the Australian television series Boney (1972), but pulled out two weeks before filming, having been picked to play the lead in Frenzy (1972). He was replaced by James Laurenson a New Zealand born but Caucasian actor with no aboriginal ancestry either.
- He turned down an offer from Richard Lester to play Aramis in The Three Musketeers (1973).
- Turned down a regular role as Doyle in the British TV series The Professionals (1977), claiming that he "couldn't possibly play a policeman".
- Won Actor of the Year Award at the Variety Club Awards in 1972 for his performances in 'Frenzy'.and 'Macbeth' (Polanski's).
- An ex SAS soldier.
- Lived with actress Francesca Annis for 4 years.
- No relation to Peter Finch, with whom he appeared in 'Sunday Bloody Sunday' (1971).
- Won Most Promising Newcomer Award at the Variety Club Awards in 1972 for his performances in 'Frenzy'.and 'Macbeth' (Polanski's).
- According to his listing in Quinlan's Film Stars (2000) he appeared in The Man With the Green Cross (1976).,The Threat (1981) and Strange (1987).
- Made a German film 'Strange' in Spain in 1987.
- Considered for Col. Colin Caine, Dr. Armstong, Dr. Bukovsky, Roger Derebridge and Kelly in Lifeforce (1985).
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