This blog piece was originally published on the 24th June on the Platform 10 campaigning blog. Although Platform 10 aligns itself with the Conservative Party, the Southern Policy Centre is non-party political.  Greg Clark has engineered a powerful decentralising bill that will provide the cities, towns and counties of England and Wales with the chance to take on the big domestic challenges of our time. How creative and effective will each area be in meeting those challenges? Five years after…