I recently did some work for my local Citizens Advice Burea. I used the parking right outside their new building which is 30 minutes parking instead of parking on the pavement near he side entrance. The manager even printed a nice sign out for me to stick in my window saying that if there is any problems please just come in the Cab office and they will get me to move or whatever.
Low and behold I came out after 30 minutes to get some stuff out the van and there is a parking ticket stuck over the notice.
I know there are regulations but that's just taking the piss.