... like the feeling I always gets when heading out away from London, you mean?
If you study the Halifax list carefully, I think you'll find that the main criteria must have been
wealth (as is, where the millionaires live)!

Don't forget that most British towns and cities were not
designed as such, but rather evolved over the centuries. And, looking at those that
were supposedly designed (Milton Keynes, Welwyn, Harlow
etc. in England, plus Cumbernauld, Livingston, Irvine in Scotland) ... well, would you say they are any better?
Bristol's not too bad, though, is it?