Ruth Porter writes for The Daily Telegraph

Think tanks are strange beasts and working for one even odder. It is an occupation that sits near the top of the ‘hard to explain what I do at a dinner party list’. For all their obscurity though, think tanks are a vital part of the British democratic process and occasionally their impact comes into focus.

A couple of years ago I sat at the annual lecture of Demos, a left of centre think tank, and heard one of the world’s leading political thinkers, Amartya Sen, speak about his latest book, Power and Capability. A panel of three then responded. Last to speak was Ed Miliband. In what he said that day were the seeds of the idea he seems to be settling on as his guiding philosophy – ‘predistribution.’

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