The latest biometric techniques being pioneered to identify criminals and solve crimes now go much further than fingerprints, DNA, face and iris scans.

Professor Mark Nixon, of the School of Electronics and Computer Science, University of Southampton, explains how looking at people's ears and the way they lay their feet on the ground could help solve a crime.

He said: "we use computers to emulate human sight and we can apply that to recognise you [using various things. The things we're working on is to recognise you by the way you walk or by the shape of your ear."

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