In 2022, journalist Alex Renton told the story of sexual abuse and cover up in Britain’s elite schools, including his own. After the Radio 4 series aired, his inbox exploded; with people sharing their personal accounts of abuse.

Last spring, and anothr email. This one came with an attachment: a scanned copy of a membership list for a pro-paedophile campaign group active in the 1970s and 80s. The group's name was the Paedophile Information Exchange, or PIE for short.

The PIE List sets Alex - himself a survivor of child sexual abuse - on a dizzying journey into the group’s dark history.

As he digs further, a source gets in touch; could Alex travel to meet him? During that meeting he hands him other secret documents, which build a picture of the criminal activities of some of PIE’s members: teachers, clergymen, social workers, government advisors.

Alex begins to wonder: where are all those hundreds of PIE members now? Are children still at risk?

Presenter: Alex Renton Producer: Caitlin Smith Researchers: Claire Harris and Marisha Currie Executive producers: Gail Champion and Gillian Wheelan Story Consultants: Jack Kibble White and Kirsty Williams Written by Alex Renton, Caitlin Smith, Jack Kibble White and Kirsty Williams Sound designer: Jon Nicholls Theme tune composed by Jeremy Warmsley Commissioning executive: Tracy Williams Commissioner: Dan Clarke

A social care consultant who advises the government on children in care, is raided by police in 1992. A detective finds evidence linking him to the Paedophile Information Exchange (PIE).

A local social worker is called in. He and the detective search through seven boxes of documents, brought from the home of the suspect. They discover that not only was he a member of PIE, but a central figure and high up in establishment circles.

Alex Renton sits down with the social worker, and hears about his decades long quest: to expose members of the Paedophile Information Exchange within social care and stop them from harming children.

In their public literature, the leaders of PIE members had always claimed their relationships with children were consensual. Alex Renton tracks down one of the boys, now a man in his fifties, who was abused by the childcare expert and his partner.

Archive: Inside Story- The Secret Life of a Paeophile, 1994, BBC. News report on the White Inquiry into Islington Children's Homes child abuse scandal, 1995, BBC; The Scandal of Crookham Court, That's Life!, 1991, BBC.

Presenter: Alex Renton Producer: Caitlin Smith Executive Producers: Gail Champion and Gillian Wheelan Story Consultants: Jack Kibble-White and Kirsty Williams Sound design: Jon Nicholls Theme Tune: Jeremy Warmsley

Details of organisations offering information and support for victims of child sexual abuse are available at bbc.co.uk/actionline

Alex Renton tries to find out more about the notes scribbled in the margins of the PIE membership list. It looks like they were written by police, who were going door to door visiting the members listed in the document. But this active investigation appears to stop suddenly in 1985. Why?

Alex starts piecing together the police investigation into the Paedophile Information Exchange.

He discovers the PIE List was seized by the Metropolitan Police in the late seventies and passed to a unit called the Obscene Publications Branch or as it was known internally 'the Dirty Squad'.

Presenter: Alex Renton Producer: Caitlin Smith Executive Producers: Gail Champion and Gillian Wheelan Story Consultants: Jack Kibble-White and Kirsty Williams Sound design: Jon Nicholls Theme Tune: Jeremy Warmsley

Actor readings: David Hounslow and Samuel James.

Archive: Newsnight, 1983 BBC; Mary Whitehouse film archive, Huntly Film Archive 1964; Mastermind 1979 , BBC.

Details of organisations offering information and support for victims of child sexual abuse are available at bbc.co.uk/actionline