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Tom Shakespeare calls for new thinking to fix the current crisis in our prisons. Against a backdrop of overcrowding, violence and high rates of reoffending, he says we need a clearer vision of what prisons are really for.

"We want them to do lots of rather different things: punish people who have broken our laws; protect the public from violent criminals; rehabilitate offenders and teach them useful employment skills. Yet we are guilty of stigmatising people who have spent some time in prison."

Producer: Adele Armstrong\nSound: Peter Bosher\nProduction coordinator: Gemma Ashman\nEditor: Bridget Harney