1. Caroline Frances John was an English actress best known for her role as Liz Shaw in the BBC science fiction television series Doctor Who, as well as several other television roles.
2. Shaw and the Doctor discussed things on a more equitable level of intelligence, and the Doctor respected and rarely patronised her.
3. New series producer Barry Letts believed the character was too intellectual to be a suitable companion to the Doctor and decided against renewing her contract for the next season.
4. During her final story, Inferno, John also played the part of Section Leader Elizabeth Shaw, an alter ego of her regular character that the Doctor encounters in an alternative time stream.
5. In the 1990s she appeared in a series of straight-to-video releases including The Stranger: Breach of the Peace, and as Liz Shaw in the P.R.O.B.E. stories written by Mark Gatiss and featuring numerous actors from the history of Doctor Who – including Jon Pertwee, Peter Davison, Colin Baker and Sylvester McCoy.
6. After The Blue Tooth she played Liz in four more Companion Chronicle audio plays Binary; The Sentinels of the New Dawn; Shadow of the Past.
7. Her final audio play, The Last Post, which she recorded on 26 January 2012, was released after her death.
8. John played the role of Laura Lyons in the BBC adaptation of the Sherlock Holmes story The Hound of the Baskervilles, opposite Tom Baker.
9. They both had roles in the audio play Dust Breeding and the TV adaptation of the political thriller A Very British Coup, although they did not appear on screen together.
10. John also appeared in a non-speaking, background role in the film Love Actually.
11. Her career in the theatre included appearances in His Majesty . John was married to actor Geoffrey Beevers.
12. The couple had three children: a daughter, Daisy, and sons Ben and Tom.