I spoke to my close friend the other day, who has been a police man for a few years now, on this very matter.
He said he often sees notes left, informing officers of drone operations by PfCO operators, so that they know it's a legal flight. This is due to us, as responsible operators, calling in and arranging flights that may peak police interest.
But, he said the problem with unlicensed, illegal flights is that most police (him included) don't know the rules and most importantly don't know what they would say should they approach/arrest. Obviously they have to give a reason for detainment, and most police aren't aware of the ANO or CAP 722 etc so are kind of stuck.
It needs, as has been said in this thread, an official word and guidance for police issued by government
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