15. The whistleblower

Former Special Demonstration Squad officer ‘Peter Black’, who was really Peter Francis, turns whistleblower.

Peter's claims include finding 'dirt' on activists involved in the campaign to get justice for the death of London teenager Stephen Lawrence.

Featuring Rob Evans from the Guardian and intelligence expert John Buckley.

Also, activist turned investigator Donal O’Driscoll reveals how the Undercover Research Group came up with a new method of identifying undercover officers called ‘The 15 Questions’.