LONDON, ENGLAND - JULY 10:  A general view over houses in Greater London on July 10, 2015 in London, England. The Chancellor of the Exchequer George Osborne unveiled a new policy document  today, which revised planning laws so Londoners can add storeys to homes, laid out plans to increase compulsory purchase powers and make planning permission for suitable brownfield sites automatic.  (Photo by Dan Kitwood/Getty Images)