By Sam Bowman Radically upzoning London and allowing millions more people to move to the capital could make Britain as rich as America with a welfare state surpassing that of Denmark or Sweden, says Sam Bowman Labour’s announcements on housing have been encouraging so far. The new government seems to “get it” that Britain needs to build more homes to get strong economic growth, and that the planning system is the biggest obstacle to that happening. But its announcements so far are stop-gap measures. Housing targets do not put homes where they are most in demand. They do not allow prosperous ci…