WOW! This was really FAST. Thanks a lot guys, I am much obliged with your help.
I live in a place close to Blackpool (Lytham St Annes) and currently with Orange I get a full 5 bars on 3G. Does the EDGE network refer to o2's own infrastructure? I guess I could easily check coverage by buying an o2 pay as you go card and moving about the house. I do not expect problems though.
I live in Blackpool and was visiting my parents in LSA this afternoon (near what used to be Guffogs on Headroomgate Road). I was quite happily getting 3G data speeds in the garden, & indoors, and only once dropped down to EDGE speed whilst indoors behind two sets of brick walls.
Call quality was excellent regardless.