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On 4月22日, the following important behind-the-scenes events were known to have occurred:
- 1966 - "Don't Shoot the Pianist" was recorded at Riverside Studios 1. (TCH 7)
- 1967 - Episode four of The Faceless Ones was recorded at Lime Grove Studios D. (TCH 10)
- 1971 - Location filming for The Dæmons took place. (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)
- 1979 - Studio filming for The Creature from the Pit took place. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 2001 - The Big Finish audio story Dust Breeding was recorded at the Moat Studios.
- 2008 - The Big Finish audio stories The Destroyer of Delights and The Chaos Pool were recorded at the Moat Studios.
- 2011 - Recording for Energy of the Daleks took place at Audio Sorcery. This was Tom Baker's first recorded story for Big Finish. (DCOM: Energy of the Daleks)
- 2020 - Recording for The Enemy of My Enemy and Echoes of Extinction was recorded remotely.