Re: As I've commented previously
Ah, yes - worn key and lock syndrome.
Began to happen to me on my old Austin 1100. Mind you, the 3 cwt of keys on the ring(s) attached to the car key probably didn't help much.
Did something about it (new key - not many pence cost) when the whole kaboodle fell out of the ignition driving through Barking one day.
Simple problem - simple solution.