21 September (production)

* 1970 - Location filming for Terror of the Autons took place. (REF: Doctor Who The Handbook: The Third Doctor)
* 1983 - Studio filming Resurrection of the Daleks took place at BBC Television Centre studio 1. (REF: Doctor Who The Handbook: The Fifth Doctor)
* 1993 - Studio filming for Dimensions in Time took place at Fountain TV studios, New Malden, Surrey. (Doctor Who The Handbook: The Seventh Doctor)
* 2002 - The Big Finish audio story Jubilee was recorded at the Moat Studios.
* 2005 - The Big Finish audio story Pier Pressure was recorded at the Moat Studios.
* 2008 - The Big Finish audio story Death in Blackpool was recorded at the Moat Studios.
* 2016 - The Big Finish audio story The Wreck of the World was recorded at the Moat Studios.
* 2016 - The Big Finish The Tribulations of Thadeus Nook was recorded at Audio Sorcery.
* 2017 - Big Finish confirmed a third series of The Diary of River Song.
* 2020 - Big Finish's audio releases Colony of Fear and The Third Doctor Adventures: Volume Seven were recorded.
* 2020 - Paul Magrs began writing A Tingle of Happiness.
* 2021 - The Big Finish audio story The Annihilators was recorded.
* 2021 - The Big Finish audio anthology Battlegrounds was recorded at the Soundhouse.