Q1 - This has been under discussion for as long as I can rememeber, and whilst 6000ft would be eminently sensible, (I don't think that there's anything that high in the UK near any of our airports is there?), like everything else, actual decision making in the UK is a tortuous process which utilises
the logic of a tortoise and an ostrich.
Q2 - I refer to the answers already given m'lord.
