File on 4 tells the story of a charismatic preacher on the run from British police for child sex offences. Three years ago, File on 4 tracked him down to an impoverished Roma community in Bulgaria where he was sexually abusing boys as young as 10. Daniel Erickson-Hull was arrested and charged by the Bulgarian authorities after he was confronted by File on 4 but has since been released and continues to offend. Yet despite overwhelming evidence, the self-styled preacher from London has been left alone. Paul Kenyon asks why the Metropolitan Police has failed to use its powers to bring him to justice and stop boys being sexually abused. Reporter: Paul Kenyon Producer: Ben Robinson Editor: Carl Johnston