This short documentary was first shown on BBC TV on 25 July 2016 and will remain on the BBC's iPlayer website for 11 months. I realise that most overseas viewers may not be able to watch it, but it may become available on YouTube in due course.

Hundreds of young people go missing in Britain every day. The police admit that vulnerable youngsters are being left at risk but say they are simply overwhelmed by the number of missing people. Reporter Darragh MacIntyre meets the families searching for clues and the parents who have been waiting years for news about their children.