John has written a few scores for films but also several directors have used his songs for their soundtracks. Also every now and then, a John song pops up in some episode of a television series. Below you find the stuff I managed to dig up.
John claims that Send Me One Line was written for a 1986 movie called 84 Charing Cross Road but it has not been used for the score. The film is about the (postal and unrequited) love between a British book shop clerk (Anthony Hopkins) and an American playwright (Anne Bancroft). John: "Jo Lustig rang me and asked me to write a song for the film so I read the book and wrote the song, I think it's a nice little tune. I wrote the song and then forgot about it so it was too late to be used in the film!"
In an interview article from around 1992, John says he has been working on some soundtracks for TV shows and movies. 'My favourite so far has been the score I did for The Rachel papers, the film of the Martin Amis novel.' This is strange as the score is credited to Chaz Jankel (the Blockhead) and David Storrs. However, Head And Heart appears to have been used in the soundtrack.
Don't Want To Know was used as theme tune of Human Remains, a BBC2 television series that started 13 November 2000 (produced by Steve Coogan). Other songs have featured for instance in Coronation Street, Eastenders, Casualty, Cold Feet and (starting September 2002) in Channel 4's White Teeth. It usually is a version of Solid Air, Head And Heart, Over The Hill, May You Never or One World and might be explained by various BBC producers or directors having been Martynized during several Old Grey Whistle Test or Glastonbury sessions.