6 December

On 6 December 1981, Lavinia Smith departed Moreton Harwood for a lecture tour in the United States. Before leaving, she arranged for a mysterious crate addressed to her niece, Sarah Jane Smith, to be left at Moreton Harwood. (TV: A Girl's Best Friend)

In 1952, the Third Doctor and Sarah Jane continued to resist against the Xhinn invasion of London. The Xhinn-created smog reached unbearable levels. (PROSE: Amorality Tale)

According to a calendar on the Snowcap base, 6 December 1986 was a Saturday. (TV: The Tenth Planet)