i'm sorry that just isn't true. I live in Pendle and have lived in Burnley. When i was young the main town in Pendle (Nelson) was lovely, vibrant shopping centre, spotless streets, plenty of pubs and cafes etc.
Now? complete dump, all the wealthy and middle class have moved out of it. It now has no high street, 1 pub (thats a shithole).
The mass influx of Eastern Europeans tipped people over the edge, people don't hate them or anything it's just they don't have much money, so don't spend in the town.
The slide started by the mass influx of Pakistanis, in the 60's and 70's. Unfortunately for towns liker above the Pakistanis that came over were the poor ones, that again had little money.