http://en.wikipedia.org/wiki/United_Kingdom
las time i checked the country was made up of 4 parts plus gibraltar and the falklands and I've lived in Wales too.
Anyway it should only be restricted to those who the governmnet believe are involved in terrorism like if they get a tipoff or something, and not just listening into random phonecalls, theres too much communication in the USA to be able to monitor all of it 24/7 in a feasible way so limit it to those your keeping an eye on.
I dont use the phone much so Im not all that botheerd.