Below is the list of all the UK cities officially awarded such a status (last update on 29.08.2022). I haven't been to all of them, but after living for some time in the UK, I got closer to my goal of visiting each of them (for example, I have only one city left in Scotland!). When I get a chance to visit a city, I mark it with red (airport/train transit), yellow (barely spent time there) and green (consider visited).