My last post suggested opening up areas for New Towns in order to provide more housing.
We are in the realm of political compromise here - the ideal would be to deregulate land use more or less entirely.
In the same spirit of compromise, Mischa Balen of the Adam Smith Institute has put forward another possibility - large scale low-density housing, combined with woodland and animal habitat, across the "green belt". The value in this is that much of the undesirable effect of more housing is specifically an effect of very high-density development, which itself is the result of releasing very small amounts of land for building.
A good idea to throw into the mix (I haven't read the actual pamphlet yet).