1)"Sorry. Half an hour ago I was a white-haired Scotsman." 2)"We don't get aliens in Sheffield".  Really? the number of mass invasions they've had in the new series alone should mean that no one doubts the existence of aliens. 3)I had to look up "dispraxia". I'd never heard of it. 4)"I never go anywhere that's just initials."   Except for UNIT, of course. 5)I think that might be the first tim…