How big is UK? Why do we have internal air flights, that seem to spend all their time taking off and landing? It's ridiculous. Even more so, now that you have to arrive at the airport an hour before the flight. Travel time from Newcastle Airport to Heathrow Airport (including early arrival) is 2 hours - and i hate to think how much fuel per passenger, how much carbon dioxide produced?
Build some high speed links between airports. No, not from city to city, from airport to airport. Link the London airports in an outer ring road: run a line up to Leeds-Bradford, on to Newcastle and then Edinburgh and Aberdeen. Suddenly people will be able to fly into Newcastle, take the shuttle (only on the ground) to London, and fly back out in the time it takes to go from one terminal to another in Heathrow,
Surprise surprise, they might just do a bit of business in Newcastle on the way past.
at £12.5million per km (the cost of the line for the French high speed rail links) it would cost around 12.5*500=£6.25bn - that's less than we spent going to Iraq where we weren't even welcome!