The ASI's Research Director's proposal to roll back the Green Belt in London to solve the housing crisis was featured in The Guardian article: "Let's at least talk about building on London's greenbelt." Read the article here.
The right leaves it to its think tanks to make the case for setting market forces free. That's what Sam Bowman of the Adam Smith Institute has done in a short film for BBC London. He accepts that some types of greenbelt land should continue to be protected, especially sylvan treasures the public can enjoy. But he argues that parts presently used for intensive farming should be considered for re-classification, liberating farmers to sell their fields to developers and letting laissez-faire do the rest.