7 January 1913: birth of Francis De Wolff, who played Vasor in The Keys of Marinus (1964) and Agamemnon in The Myth Makers (1965).
7 January 1924: birth of Geoffrey Bayldon, who played Organon in The Creature from the Pit (1979) and the alternate timeline Doctor-who-never-left-Gallifrey in Big Finish audios Auld Mortality (2003) and A Storm of Angels (2005). Also Catweazle.
ii) broadcast anniversaries
7 January 1967: broadcast of fourth episode of The Highlanders. The Doctor rescues everyone, Grey is led off to jail, and Jamie leaves with the Tardis crew.
7 January 1978: broadcast of first episode of Underworld. The Doctor lands on the Minyans' ship, and they are bombarded by space debris.