Trivia: Robophobia, an irrational fear of robots, is at one point referred to as 'Grimwade's syndrome'. This was an in-joke reference to production assistant Peter Grimwade (later to become a director and writer on the series) who had bemoaned the fact that the stories on which he was assigned to work almost always involved robots.
Trivia: The deactivation discs for the robots (or "corpse markers" as they are referred to in the script) are not as glamorous or hi-tech as you might think. They are, in fact, bicycle reflector discs, bought from Halford's Cycle Shops.
Answer: TARDISes are generally available for properly authorised use on Gallifrey; they're not usually assigned to a particular Timelord on a long-term basis. The Doctor stole his when he left his homeworld.
Tailkinker ★