1951

Dates unknown

 * The last Witchcraft Act is repealed in Great Britain (DW: The Dæmons).
 * The radio telescope is invented (DW: Pyramids of Mars).
 * The Doctor and Ace attend the Festival of Britain (NA: Timewyrm: Exodus)
 * The Doctor (Eighth incarnation) also passes through the Festival (NA: Endgame)

Late Spring

 * between 20th April and 20th May - birth of Sarah Jane Smith, companion of the Third and Fourth Doctors. (SJA: Secrets of the Stars reveals that she is a Taurus.)

April

 * 13 - Peter Davison, the fifth actor to portray the Doctor, is born Peter Moffett at Streatham, London.
 * 20 - Louise Jameson, who portrayed companion Leela, is born at Wanstead, London.

June

 * 28 - Lalla Ward, who portrayed Princess Astra in "The Armageddon Factor" before assuming the role of Romana, is born Lady Sarah Ward, daughter of Lord Bangor, in London.