Oliver Letwin's appointment as Minister for the Cabinet Office is, I hope, a big boost for the mutuals agenda.

As the new Minister for the Cabinet Office, Oliver Letwin is a Tory-moderniser and, perhaps more than any other figure, he has worked to drive progressive new agendas inside the Conservative Party.

While most people prefer these days not to discuss Big Society, one of the more productive ideas embedded within it was the idea of Public Service Mutuals.