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On 10月21日, the following important behind-the-scenes events were known to have occurred:
- 1967 - Episode one of The Ice Warriors was recorded at Lime Grove Studios D. (TCH 11)
- 1969 - Location filming for Spearhead from Space took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1971 - Location filming for The Sea Devils took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1975 - Studio filming for The Brain of Morbius took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1981 - Studio filming for Black Orchid took place. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 2008 - The Big Finish audio story The Scapegoat was recorded at the Moat Studios.
- 2010 - The Big Finish audio story The Selachian Gambit was recorded at the Moat Studios.
- 2015 - The Big Finish audio story Time Reaver was recorded at the Moat Studios.
- 2020 - Big Finish's audio anthology The Third Doctor Adventures: Volume Seven was recorded.