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Apparently most of us can only recall 20 per cent of the faces we've seen. But PC Eliot Porritt is different. He's a 'super recogniser' who can remember up to 95 per cent of the faces he's seen - and he's using his skills to help police in London crack down on crime. His unit sifts through hundreds of images of unsolved crime scenes trying to identify criminals. Photo: Police officers in front of a bank of CCTV screens. Credit: Kirsty Wigglesworth/Getty Images.