23 September (production)
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On 23 September, 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)
- 1993 - Location filming for Dimensions in Time took place. (Doctor Who The Handbook: The Seventh Doctor)
- 2000 - Recording for The Mutant Phase took place at The Moat Studios.
- 2009 - Recording for The Song of Megaptera took place 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.
