The Doctor Who Production Diary: April 23rd

1965 Robert Holmes meets with Donald Tosh regarding a story idea that will ultimately become The Krotons The Krotons
1965 Recording for The Space Museum takes place in BBC Television Centre Studio 4 The Space Museum
1966 Debut broadcast of The Celestial Toymaker episode four, The Final Test, on BBC1; in response to the complaints from Frank Richards' representatives, a continuity announcement airs to emphasise that Cyril is not intended to be Billy Bunter The Celestial Toymaker
1971 Location filming for The Daemons takes place in Ramsbury, Wiltshire The Daemons
1975 Recording for Terror Of The Zygons takes place in BBC Television Centre Studio 4; this is Ian Marter's last day as a regular member of the Doctor Who cast Terror Of The Zygons
1979 Recording for The Creature From The Pit takes place in BBC Television Centre Studio 6 The Creature From The Pit
1981 Lesley Elizabeth Thomas is commissioned to provide a storyline for “Way Down Yonder”, which was intended to feature location filming in the southern United States The Fifth Doctor
1982 Bill Lyons is commissioned to write one or more episodes of “Parasites” The Fifth Doctor
2005 Debut broadcast of World War Three on BBC1 Aliens Of London / World War Three
2008 Location filming for The Next Doctor takes place in Gloucester, Gloucestershire The Next Doctor
2009 Recording for The End Of Time takes place at Upper Boat Studios The End Of Time
2011 Debut broadcast of The Impossible Astronaut on BBC1 and BBC1 HD The Impossible Astronaut / Day Of The Moon
2012 Recording for Asylum Of The Daleks takes place at BBC Roath Lock Asylum Of The Daleks
2012 Recording for The Angels Take Manhattan takes place at BBC Roath Lock The Angels Take Manhattan
2013 Recording for The Day Of The Doctor takes place at BBC Roath Lock The Day Of The Doctor
2016 The BBC announces that Pearl Mackie will play new Doctor Who companion Bill Bill