The Doctor Who Production Diary: May 25th

1966 Anneke Wills, cast as new companion Polly, is contracted for eighteen episodes starting with The War Machines Polly
1966 Recording for The War Machines takes place on the backlot of the BBC Television Film Studios in Ealing, London The War Machines
1968 Debut broadcast of The Wheel In Space episode five on BBC One The Wheel In Space
1971 Malcolm Hulke is commissioned to write The Sea Devils The Sea Devils
1971 Robert Sloman is commissioned to provide a storyline for “The Daleks In London” The Third Doctor
1974 Debut broadcast of Planet Of The Spiders episode four on BBC One Planet Of The Spiders
1976 Recording for The Masque Of Mandragora takes place at BBC Television Centre Studio 3 in White City, London The Masque Of Mandragora
1977 Recording for Horror Of Fang Rock takes place at Pebble Mill Studio A in Birmingham, West Midlands; due to a scheduling crunch at BBC Television Centre, this is the first time that principal studio recording for Doctor Who occurs outside London Horror Of Fang Rock
2012 Recording for Hide takes place in Wraxall, Bristol Hide
2015 Recording for The Zygon Invasion / The Zygon Inversion takes place in Cardiff, Wales The Zygon Invasion / The Zygon Inversion