5/5. Dr Raj Persaud visits the child protection unit at the Metropolitan Police, the nerve centre from which the police track down Britain's paedophiles. He finds out what sort of character it takes to work there and the kind of counselling available to officers. He also discovers what kind of treament is available to convicted paedophiles and whether or not it works.
Producer Angharad Law
(Repeated tomorrow at 4.30pm)