This article about a day of the year is currently under construction. It's likely to be a bit messy.
On 21 January, the following important behind-the-scenes events were known to have occurred:
- 1966 - "War of God" was recorded at Riverside Studios 1. (TCH 7)
- 1967 - Episode three of The Underwater Menace was recorded at Riverside Studios 1. (TCH 9)
- 2010 - Recording for The Time Vampire took place at The Moat Studios.
- 2013 - Recording for Persuasion took place at The Moat Studios.
- 2014 - Recording for Counter-Measures: Series 3 took place at The Moat Studios.