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What is a political think tank?

23 September 2010 Last updated at 12:18 BST

What do the mysterious brainiacs in a political "think tank" actually do?

The Social Market Foundation has recently published Roads to Recovery: Reducing congestion through shared ownership and Anglo-Flexicurity 2: Insuring against Unemployment in the UK.

Adam Fleming talks to Neil O'Brien of Policy Exchange and Chris Nicholson of CentreForum and then asks taxi drivers what they make of it all.

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