Illegal parking!

Just a little bee a have in my bonnet; here is a "paddy waggon" parked right up on the pavement outside the local police station, (and close to my home) and not 50 yards away is a car with a ticket for parking on a single yellow line, as it's between 8am and 6pm. I (rather sadly I know!)have dozens of photo's of police related vehicles parked at all times like this, as the double standards really bugs me!