Mouthy is right, Devon is an excellent choice. The south-west is considerably warmer than the rest of the country and house prices aren't too bad. London and the south-east is very expensive. The North is cheaper but the weather is crap.
The Health service is better here too, although we are talking about the National Health Service which you would be entitled to receive virtually free of charge as a visitor. If you want an immediate health service you can always pay for it.
Public transport is not very reliable because our infra-structure is following 150 year old routes, constant essential maintenance on rail and road leads to frequent delays.
Also on the down side, service in restaurants etc is generally poorer than in the States.
But, we have:
Beautiful countryside! (Remember, green = rain)
Thousands of historical sites to visit.