1951

Dates unknown

 * The radio telescope is invented (DW: Pyramids of Mars).
 * Mrs Randall gets given a prize as "Miss Ealing". (SJA: Eye of the Gorgon)

Late Spring

 * Between 20th April and 20th May - Birth of Sarah Jane Smith. (Date given: SJA: Secrets of the Stars, SJA: The Temptation of Sarah Jane Smith.)

August

 * 18 - Eddie and Barbara Smith, parents of Sarah Jane, die in a car accident. (SJA: The Temptation of Sarah Jane Smith)

January

 * 7 - Helen Worth is born.

March

 * 9 - Chris Clough is born.

April

 * 13 - Peter Davison, who portrayed Fifth Doctor, is born as Peter Moffett at Streatham, London.
 * 20 - Louise Jameson, who portrayed companion Leela, is born at Wanstead, London.

May

 * Before the 25th - The Doctor and Ace attend the Festival of Britain (NA: Timewyrm: Exodus)
 * The Doctor also passes through the Festival at the same time (EDA: Endgame)

June

 * 4 - David Yip is born.
 * 22 - The last Witchcraft Act is repealed in Great Britain (DW: The Dæmons).
 * 24 - David Rodigan is born.
 * 24 - Simon Rouse is born.
 * 28 - Lalla Ward, who portrayed Princess Astra and the second incarnation of companion Romana is born Lady Sarah Ward, daughter of Lord Bangor, in London.

July

 * 13 - Joseph Lederer is born.
 * 17 - Dave Chapman is born.
 * 20 - Jeff Rawle is born.

September

 * 24 - David Banks is born.

December

 * 21 - Jane How is born.

Date unknown

 * Angela Bruce is born.
 * Nigel Humphreys is born.