As noted by Les Carr, who pointed this out in comments following my blogging on “A Good Man Goes to War”:
In January 1995, Steven Moffat posted this to rec.arts.drwho:
Here’s a particularly stupid theory. If we take “The Doctor” to be the Doctor’s name – even if it is in the form of a title no doubt meaning something deep and Gallifreyan – perhaps our earthly use of the word “doctor” meaning healer or wise man is direct result of the Doctor’s multiple interventions in our history as a healer and wise man. In other words, we got it from him. This is a very silly idea and I’m consequently rather proud of it.
Why all this fuss about canon – and, indeed, continuity – in a show about a man who changes history for a living?
We can’t trust this guy.
(I’ve been thinking about Doctor Who for a long time, too, but no one’s paying me the big bucks (yet) to incorporate those thoughts into episodes. Another reason for me to hateses the Moffat.)
(If you stumble across a cool Doctor Who thing, feel free to email me with a link.)