May I remind my right hon. Friend that established green belt land represents less than 20 per cent. of England's countryside? Is that not all the more reason for asserting that the Government will protect those green belts, and for reminding any political party which thinks that the green belts should be breached that such belts command widespread support? In the words three years ago of the Select Committee on the Environment, the green belts should be regarded as sacrosanct.