There's a fun bit in one of the Morse episodes where he's walking down the corridor in the Oxford police station and comes to a door with a number-button lock on it. You know the style - 2 rows of numbers on a vertical panel and you press in 4 numbers to clear the lock. We had them on certain rooms at work. You have to stand there for at least 15-20 seconds to operate the thing.

Good old John Thaw got to the door, waved his fingers vaguely in front of it and opened it and walked through without breaking step. It's little things like that...

... which reminds me, Barnaby produced some "passport photos" of a missing suspect the other day - huge snaps that could never have been accepted as passport pics in a million years.