i) births and deaths

1 February 1946: birth of the much missed Elisabeth Sladen, who played Sarah Jane Smith (companion to Third and Fourth Doctors, 1973-76; various appearances from then on, culminating in her own series from 2007 to 2011).

1 February 1962: birth of Lisa Bowerman, who played Karra in Survival (Seventh Doctor, 1989), the last person killed by the Master in Old Who; and has also played Bernice Summerfield in Big Finish audios since 1998, as well as taking a hand with directing and writing.

1 February 2000: death of Reginald Jessup, who played Admiral de Coligny's servant in the (lost) story we now call The Massacre (First Doctor, 1966) and Time Lord Savar in The Invasion of Time (Fourth Doctor, 1978).

1 February 2019: death of Clive Swift, who played Mr Jobel in Revelation of the Daleks (Sixth Doctor, 1985) and Mr Copper in Voyage of the Damned (Tenth Doctor, 2007).

ii) broadcast anniversaries

1 February 1964: broadcast of "The Rescue", seventh episode of the story we now call The Daleks (and nothing to do with the story we now call The Rescue). Ian, Barbara and the Thals destroy the Daleks' power source, defeating them, and rescue the Doctor and Susan.

1 February 1969: broadcast of second episode of The Seeds of Death. The Doctor, Zoe and Jamie head for the Moon by rocket; Miss Kelly T-Mats to the Moon and repairs the equipment but is captured by the Ice Warriors.

1 February 1975: broadcast of second episode of The Ark in Space. The humans on the Ark start to wake up; but Noah, their leader, has been infected by the Wirrn.

1 February 1982: broadcast of first episode of Kinda. The Doctor and Adric are captured by the Earth expedition on Deva Loka; Tegan's mind is ensnared by the wind chimes.

1 February 1983: broadcast of first epsiode of Mawdryn Undead