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On 4月12日, the following important behind-the-scenes events were known to have occurred:
- 1965 - Pre-filming for The Chase at Ealing Studios began on Stage 3A/B. Filmed that day were all the scenes involving Abraham Lincoln, William Shakespeare, Queen Elizabeth and Francis Bacon. (TCH 5)
- 1968 - Episode two of The Wheel in Space was recorded at BBC Television Centre Studio 3. (TCH 12)
- 1977 - Studio filming for The Invisible Enemy took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1982 - Studio filming for Snakedance took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fifth 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)
- 1996 - The first trailers for the Doctor Who TV movie began airing on Fox.
- 2011 - The Big Finish audio story The Witch from the Well was recorded at the Moat Studios.
- 2012 - Big Finish's audio adaptation of the unproduced TV story The Dark Planet was recorded at the Moat Studios.
- 2017 - The Big Finish audio story The Night Witches was recorded at the Moat Studios.
- 2017 - Big Finish announced the audio box set Ruler of the Universe.
- 2019 - Big Finish's The War Master audio anthology Anti-Genesis was recorded at the Moat Studios.
- 2021 - The Big Finish audio story Watchers was recorded remotely.