Emma Thompson, Alistair McGowan and Tory nitwit brat Zac Goldsmith have all put up money to buy a field north of Heathrow, which BAA wants as part of its proposed third runway, according to the Daily Telegraph. The intent, of course, is to stop BAA being able to buy all the relevant land, and frankly - from a libertarian point of view - they should be perfectly entitled to do so.
You see ultimately they can make a rational choice. BAA can offer a price which is as much as it is willing to do so to buy the land, and if Greenpeace can take the money (which could fund countless other campaigns) or sit on the land and let BAA try something different.
So all in all, it's not something significant - an organisation that has scant regard for private property rights is using it to delay a rational commercial project by a private company. I've always said that if BAA can finance a third runway at Heathrow commercially, and buy the land to build it, it shouldn't be prevented from doing so. There may be issues around noise, but unless flights comprise a nuisance over and above that accepted by property owners on flightpaths, it shouldn't be an issue. Yes, I have lived under the flightpath myself.
Of course, if someone can put forward a private business case for a new airport for London at Thames, like Boris Johnson supports, let them do so. However, I wont be holding my breath, sadly.