Chopjock, are you having a laugh? Police Aviation Services is a working title for a company which also provides Air Ambulance helis, crews and engineering to several operations. The colour scheme of the helis they provide is entirely a matter for the Air Ambo charity to choose - PAS don't paint them all like 90's police cars.
Any Kentish fule kno that their police do not have a heli (they have to borrow one from neighbouring counties), and the ones that can read - OK, possibly not applicable here - can see 'Air Ambulance' on the side of the aircraft.
...and as a Devon Council Tax payer, I wish I could share your certainty.