Professor Clapson said: “The green belt sits around London and it’s all very attractive, but I also think that when you’ve been to the Cotswolds, Cambria or the Peak District, it’s nothing special.
“Why not just let London cat the green belt up? You could build great big family homes there, nice new urban villages to satisfy the demand for new communities, all planned to high-density, sustainable planning principles.”
He added: “London could become another Tokyo, a mega city.”
He also discussed issues around second homeownership and the need to relax planning laws.