To get rid of the aeroplanes, of course. Envy of those who can afford to buy helicopters or twin engine private planes. Noisy and polluting, sort of like fox-hunting, favoured by toffs. As opposed to Russian oligarchs who can afford to buy football teams and get the District Council to splash out on a stadium....hotel.....sports centre, etc. Of course if greenbelt land is freed up to build houses, somebody will make money out of it, especially with M40 access to London.