Bring on the London devolution revolution

The powers devolved to London regional layer of government are designed to be just big enough for Mayors to take the blame when things go wrong yet also small enough to provide few levers for doing much to put them right. The job provides a high profile platform and many see it as a stepping stone to a bigger national job – the last incumbent certainly did. But both Boris Johnson and Sadiq Kahn were and are frequently accused by critics of inaction.