Wow, I grew up in Liverpool (and tested my Robot Wars bots in exchanges, since my team mate had access working for BT)
I was expecting to see all the high-end areas there, and yes, it was - Gattacre (the rich part) cressington, Childwall. Then F**k me, if I didn't see my home exchange, Stoneycroft there. It's a poor area, next to Kensington, which is one of the poorest in the country (and 2nd poorest in Europe back in the 80s). There was no DSL there as recently as 2003 (when i moved out) and phone line quality was BAD. Guess that prompted them to completely upgrade the exchanges.