I find that anyone south of Watford Gap is pretty unfriendly myself...it's a different world down there.
I've walked around London at 8.30 am before and I didn't get one smile. Do it in the North or Midlands, and plenty of people do.
Heck, everyones in such a rush too. Perhaps thats why they're unfriendly - they're busier than everyone else.
Drive to Wales or something, I've heard that Welsh birds are well dirty.