The postmasters/mistresses thing was shocking: many lives ruined by it, and it has taken so long to get the sentences quashed.

My husband got a ticket through the post after parking on 2 consecutive days in the same car park in Livingston, Scotland (sent from some parking agency in the S of England!!) - based on number-plate recognition on entering and leaving the car park. It alleged he had been there for 23 hours! We just wrote back and said, "check again: he was there for an hour on each of 2 days" - AND "no-one in their right mind would leave their car unattended in that car park for 23 hours". We never heard any more. In any case it was one of those private company tickets which are not legally enforceable.