1979 (production)

May

 * 30 April to 3 May - Filming for City of Death took place in Paris, marking the first time Doctor Who was filmed outside the United Kingdom.

October

 * 15-19 October - Location filming for Shada took place. In 1983, some of these shots were used in The Five Doctors to represent the Fourth Doctor and Romana after Tom Baker declined the invitation to return. (REF: Doctor Who The Handbook: The Fourth Doctor)
 * 22 October - Pre-filming for Shada took place at Ealing Studios. (REF: Doctor Who The Handbook: The Fourth Doctor)

November

 * Early November - John Nathan-Turner officially began his ten-year stint as producer of Doctor Who (he was not involved in the production of the season then underway). Among the changes he implemented for the coming season were the introduction of a new arrangement of the theme song by Peter Howell, an updated opening credits sequence, and the announcement that the 1980-81 season would be Tom Baker's last as the Fourth Doctor.
 * 3-5 November - Studio filming for Shada took place at BBC Television Centre studio 3. Prematurely, this concluded production on the story. Further studio filming was planned for later in the month and the beginning of December, but industrial action prevented these recording sessions to take place, leaving the story incomplete. (REF: Doctor Who The Handbook: The Fourth Doctor)
 * 19-20 November - Studio filming for Shada was planned to took place at BBC Television Centre studio 6. However, the fallout of a BBC strike prevented this from happening. (REF: Doctor Who The Handbook: The Fourth Doctor)

December

 * 1-3 December - Studio filming for Shada was planned to took place at BBC Television Centre studio 3. However, the fallout of a BBC strike prevented this from happening. (REF: Doctor Who The Handbook: The Fourth Doctor)