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Prisons: do they work; are there enough of them; are too many, or too few people in them? We speak to former cabinet minister Iain Duncan-Smith and Mike Rolfe from the Prison Officers Association. Also: Why President Trump's National Security Adviser Mike Flynn in his trouble. And as the Co-Op Bank offers itself up for sale, why members believe its ethical investing model will survive. Picture: Pentonville prison Credit: Anthony Devlin/PA Wire.