Funnily when I was in London, coppers knocked on my door at least twice a year on average. It was a running gag towards the end.

Considering that I come from a third world nation where the cops often pull members of my community aside for searches and special checks, the British police force for all their faults are a breath of fresh air. I've been exactly in that spot, with police using surveillance data and national ID data to arrest protestors and put them under false charges. I've personally almost been arrested for no reason except for 1.) walking in the night alone and 2.) walking at night in suspicious clothing (i.e. T-shirt and shorts).