Whilst this aircraft was contracted to the police, it was operated by a commercial operator who provided its' pilot.
Compensation will be a matter for that operator and their insurance company unless it can be established that some action by the Police was the cause of the event - unlikely it would seem.
Really?
Access to a company ops manual or the old 612, more specifically in detail part 2, may offer a differing view. (I don't know which OM was in use at the time)
Just another piece of this massive jigsaw.