My BIL (Mrs Backwoodsperson’s brother) has been a police officer all of his working life - in the RAF Police, Cambridgeshire Police and, for the past 17-or-so years, in the Toronto ON Force - and he sometimes refers to himself as a ‘cop’. But AFAIC that’s his right. I always describe him as a police officer, but I don’t imagine he would feel offended if I called him a ‘cop’.

In my part of the Backwoods, the usual offensive terms for a police officer are ‘rozzer’, ‘PC Plod’, and ‘pig’. I’m sure there may be others, especially amongst young people, although why anyone feels the need to insult men and women who are doing a difficult, stressful, and often dirty, job is beyond my ken.