You may be right. One one occasion we took our Mobile Station van down to the square on a Saturday night. By a mistake it was left there (the usual - the person with the keys went home and left them in their locker). A 'enthusiastic' traffic thingumabob (council I hasten to add) gave it a parking ticket. The local paper reported it and the force paid up. Cakes were bought by the relevant parties and the inspector pretended to be cross. In reality, our ethos is 'assume everything you do and say is being recorded and every email you send will be on the front page of the daily mail'. Unless it is an emergency, police vehicles are not exempt from parking restrictions and any complaint will be investigated. All out vehicles are fitted with trackers and telematics which can be examined.