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On 3月12日, the following important behind-the-scenes events were known to have occurred:
- 1965 - "The Knight of Jaffa" was recorded at Riverside Studios 1. (TCH 5)
- 1973 - Location filming for The Green Death took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1974 - Location filming for Planet of the Spiders took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 2000 - The Big Finish audio story The Fires of Vulcan was recorded at the Moat Studios.
- 2010 - The Sun tabloid reported that BBC Worldwide had signed a £10-million deal with Nintendo for the development of a Doctor Who game for the Wii and DS gaming systems.
- 2012 - Roath Lock was officially opened by Welsh First Minister Carwyn Jones.
- 2018 - The fourth and fifth series of Big Finish's audio series The Diary of River Song were recorded.
- 2019 - The second series of Big Finish's audio series The Lives of Captain Jack was recorded at the Soundhouse.
- 2019 - The Big Finish audio story Daughter of the Gods was recorded at the Moat Studios.
- 2020 - Big Finish's The New Adventures of Bernice Summerfield audio anthology Lost in Translation was recorded at the Moat Studios.