Thanks everyone.
I did research on Nottingham to Reading -- it can be done by a train change in Derby but there's no win since just Derby-Reading alone takes longer a bit than Nottingham-London and the rail air bus from Reading to Heathrow is not particularly faster (52 minutes but it's a bus) than the tube from KX to LHR (60 minutes and almost always is 60 minutes).
I guess this won't change until WRAtH (seriously? someone codenamed a tunnel wrath?) is built which is ridiculously far into the future.
What's the catch in
http://www.blackberrycars.com/kings-...throw-airport/ this? 30 pounds sounds like a steal.