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On 4月17日, the following important behind-the-scenes events were known to have occurred:
- 1964 - "Sentence of Death" was recorded at Lime Grove Studios. (INFO: "Sentence of Death")
- 1973 - Studio filming for The Green Death took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Third Doctor)
- 1974 - Studio filming for Planet of the Spiders took place at BBC Television Centre studio 8. (REF: Doctor Who The Handbook: The Third Doctor)
- 2007 - The Big Finish audio story Valhalla was recorded at the Moat Studios.
- 2009 - Big Finish Productions announced it was ending the Short Trips line in book form, since the BBC had not renewed the company's license to issue Doctor Who stories in print.
- 2016 - The Big Finish audio story The Morton Legacy was recorded at the Moat Studios.