Rishi Sunak on Thursday “stepped in” to try to sort out London’s housing crisis blaming Sadiq Khan for sky-high property prices destroying the dreams of many Londoners to own their own home.The Prime Minister announced a review of the London Plan to identify new sites to build tens of thousands new homes in the capital.He also gave the Mayor of London an autumn deadline - three to four months - to agree progress towards changes to the city’s long-term masterplan or Housing Secretary Michael Gove may use powers to intervene.“The Mayor has failed to deliver the homes that London needs. This has driven up house prices and made it harder for families to get on the housing ladder in the first place,” said Mr Sunak.