According to G-INFO, G-KAAT is registered to Police Aviation Services. It looks very much like a "police helicopter".
If you assume the scrotes can not read, you could understand why they did what they did. They were perhaps trying to get back at the police. (Oh look, there's a police helicopter on the ground, quick now it's our turn to get our own back for chasing us with impunity all the time).
Is it clever to disguise an air ambulance to look like a police heli?
That would never happen in Devon and Cornwall.