Thanks for the link Bristol Traveller, and the vague hope.
Don't have your rest-of-the-world problem but couldn't agree more about LHR.
Notwithstanding the distance, on a good day it takes well over an hour from plane to car (thank goodness for Hertz Gold), and then up to 30 mins in the rush hour to leave the perimeter.
Compare that with BRS where I would swear that one morning I was sitting in my car before my seat on the plane had had a chance to go cold.