Wales can provide some candidates - Rhyl (full of Scousers who have passed a special Obnoxious Scouser test to qualify for residence.) Holyhead (Bacup with a harbour.) Merthyr Tydfil (makes Radcliffe look like Beverley Hills.)
Liverpool centre is quite OK tbh, but some of the hinterlands - fuck me. Bootle could give pre-reunification East Berlin a run for its money.
Nottingham has some singularly weird people in it.
Stoke, yeah, shit tip. But I did use to visit quite often at one time and found some of the locals to be surprisingly affable.
Bolton and Rochdale - both fallen badly in the last 30 years. Although both have some nice bits.
(EDIT) How did I forget fucking Grimsby? Mega shithole that stinks of fish. Harpurhey if moved to the sea and enlarged, would be a cut above it.