25 June (production)


 * 1965 - "A Battle of Wits" was recorded at BBC Television Centre Studio 4. (INFO: "A Battle of Wits")
 * 1965 - Pre-filming for Galaxy 4 concluded at Ealing Studios. Pre-filming for Mission to the Unknown also took place on that day at Ealing, showing Jeff Garvey mutating into a Varga plant. (TCH 6)
 * 1969 - A full script was requested from David Whitaker for The Carriers of Death. He submitted two in July.
 * 1987 - Location filming for Delta and the Bannermen took place. (Doctor Who The Handbook: The Seventh Doctor)
 * 1998 - Recording for Oh No It Isn't! began. This was Big Finish Productions' first-ever recording session
 * 2009 - Recording for A Thousand Tiny Wings took place at The Moat Studios.
 * 2012 - Recording for The Flames of Cadiz took place at The Moat Studios.
 * 2013 - Recording for Scavenger took place at The Moat Studios.
 * 2016 - Big Finish confirmed the audio box set The Unbound Universe.