The Doctor Who Production Diary: March 18th

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1964 William Hartnell's contract is extended for sixteen episodes starting with The Reign Of Terror The First Doctor
1964 William Russell's contract is extended for sixteen episodes starting with The Reign Of Terror Ian 
Chesterton
1964 Jacqueline Hill's contract is extended for sixteen episodes starting with The Reign Of Terror Barbara
Wright
1964 Carole Ann Ford's contract is extended for sixteen episodes starting with The Reign Of Terror Susan
1966 Recording for The Celestial Toymaker takes place at Riverside Studio 1 in Hammersmith, London The Celestial Toymaker
1967 Recording for The Macra Terror takes place at Lime Grove Studio D in Shepherd's Bush, London The Macra Terror
1967 Debut broadcast of The Macra Terror episode two on BBC One The Macra Terror
1968 Recording for The Wheel In Space takes place at the BBC Television Film Studios in Ealing, London The Wheel In Space
1972 Debut broadcast of The Sea Devils episode four on BBC One The Sea Devils
1975 Recording for Terror Of The Zygons takes place in West Sussex, at Storrington and South Ambersham Terror Of The Zygons
1980 Two storylines are commissioned: “Farer Nohan” by Andrew Stephenson, and “Mouth Of Grath” by Malcolm Edwards and Leroy Kettle The Fourth Doctor
1983 Recording for The Five Doctors takes place at the BBC Television Film Studios in Ealing, London The Five Doctors
2008 Recording for The Stolen Earth / Journey's End takes place in Wales, at Michaelston-le-Pit and Cardiff The Stolen Earth / Journey's End
2009 Recording for The Waters Of Mars takes place at Upper Boat Studios in Upper Boat, Wales The Waters Of Mars
2010 Piers Wenger announces that Doctor Who has been renewed for Season Thirty-Two The Eleventh Doctor
2010 Recording for The Lodger takes place at Upper Boat Studios in Upper Boat, Wales The Lodger
2010 Recording for The Pandorica Opens / The Big Bang takes place in Cardiff, Wales The Pandorica Opens / The Big Bang
2011 Debut broadcast of Space / Time on BBC One and BBC One HD Space / Time
2011 Recording for The Girl Who Waited takes place at Upper Boat Studios in Upper Boat, Wales The Girl Who Waited
2011 Recording for The God Complex takes place at Upper Boat Studios in Upper Boat, Wales The God Complex
2014 Recording for Listen takes place in Cardiff, Wales Listen
2014 Recording for Time Heist takes place in Cardiff, Wales Time Heist
2015 Recording for The Magician's Apprentice / The Witch's Familiar takes place in Cardiff, Wales, including at Roath Lock Studios The Magician's Apprentice / The Witch's Familiar