In general, to complain about this sort of thing, here is where to do it: https://www.caa.co.uk/Our-work/Make-a-report-or-complaint/Report-a-potential-breach-of-aviation-law/
The problem is that the police have a specific exception from the rules, and it's very permissive (i.e. even flying to/from an incident, they don't have to comply).