The BBC has tracked down a British paedophile who breached strict court orders by fleeing the country.

The man embedded himself in a Roma community in central Bulgaria, out of the reach of British police.

An investigation by the BBC's File on 4 has discovered that 581 convicted sex offenders are missing or have failed to report to UK police forces.

File on 4 is on BBC Radio 4 on Tuesday, September 10 at 8pm and afterwards can be downloaded from the BBC Sounds app.