Nobody has mentioned Corby yet.
I had the misfortune to work there for a month about 15 years ago - concrete flats laid out in an incomprensible maze, poo on the stairs, boarded up windows, full of depressed Scots who moved down there for jobs at the steelworks, which then shut.
Concrete estate pubs with no windows...concrete shops in town. The biggest, newest building in the town centre was the Job Centre and the most popular venue was the Sun Page 3 Fun Pub.
I live in hope that it might have improved, but am not volunteering to go back and investigate.