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On 4月9日, the following important behind-the-scenes events were known to have occurred:
- 1965 - "The Dimensions of Time" was recorded at BBC Television Centre Studio 4. (INFO: "The Dimensions of Time")
- 1965 - Location filming for The Chase took place at Camber Sands, which doubled for the Sagarro Desert. (TCH 5)
- 1978 - Studio filming for The Ribos Operation took place at BBC Television Centre studio 4. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1979 - Studio filming for The Creature from the Pit took place. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1986 - Location filming for The Mysterious Planet took place. (REF: Doctor Who The Handbook: The Sixth Doctor)
- 1988 - Location filming for Remembrance of the Daleks took place. (Doctor Who The Handbook: The Seventh Doctor)
- 2008 - The BBC announced that there would be a Doctor Who at the Proms on 27 July of that year.
- 2018 - The Big Finish audio anthology The Seventh Doctor: The New Adventures: Volume One was recorded at the Moat Studios.
- 2019 - Big Finish's The War Master audio anthology Anti-Genesis was recorded at the Moat Studios.
- 2020 - The Big Finish audio story Echoes of Extinction was recorded remotely.