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On 4月8日, the following important behind-the-scenes events were known to have occurred:
- 1966 - "The Final Test" was recorded at Riverside Studios 1. (TCH 7)
- 1967 - Episode two of The Faceless Ones was recorded at Lime Grove Studios D. (TCH 10)
- 1970 - Nicholas Courtney signed on for another season as Brigadier Lethbridge-Stewart.
- 1970 - Pre-filming for Inferno took place on Stage 2 of Ealing Studios. (REF: Doctor Who The Handbook: The Third Doctor)
- 1975 - Studio filming for Terror of the Zygons took place at BBC Television Centre studio 3. (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)
- 1987 - Location filming for Time and the Rani took place. (Doctor Who The Handbook: The Seventh Doctor)
- 1988 - Location filming for Remembrance of the Daleks took place. (Doctor Who The Handbook: The Seventh Doctor)
- 1989 - Location filming for The Curse of Fenric took place. (Doctor Who The Handbook: The Seventh Doctor)
- 2000 - Big Finish's Bernice Summerfield story The Skymines of Karthos was recorded.
- 2011 - The Big Finish audio story Army of Death was recorded at the Moat Studios.
- 2014 - Big Finish's linked stories The Fate of Krelos / Return to Telos were recorded at Audio Sorcery.
- 2017 - Big Finish announced the fourth series of The Early Adventures range.
- 2021 - The Big Finish audio story The Auton Infinity was recorded remotely.