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On 9月23日, the following important behind-the-scenes events were known to have occurred:
- 1967 - Episode three of The Abominable Snowmen was recorded at Lime Grove Studios D. (TCH 11)
- 1970 - Location filming for Terror of the Autons took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1973 - Location filming for Invasion of the Dinosaurs took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1982 - Studio filming for Mawdryn Undead took place at BBC Television Centre studio 8. (REF: Doctor Who The Handbook: The Fifth 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 - Location filming for Dimensions in Time took place. (Doctor Who The Handbook: The Seventh Doctor)
- 2000 - The Big Finish audio story The Mutant Phase was recorded at the Moat Studios.
- 2008 - A BBC press release announced the title of the 2008 Christmas special, The Next Doctor, renewing fan speculation regarding David Tennant's future with the series into 2009.
- 2009 - Big Finish's audio adaptation of the unproduced TV story The Song of the Space Whale was recorded at the Moat Studios.
- 2021 - Big Finish's audio releases The Annihilators and Short Trips: Volume 11 were recorded.
- 2021 - The Big Finish audio anthology Battlegrounds was recorded at the Soundhouse.