Joshua Rozenberg speaks to a former jailhouse lawyer about his time behind bars and the cases he tackled on behalf of his fellow inmates. He also hears from well-known broadcaster, Stephen Nolan, about the extraordinary steps he took in tracking down, and launching a libel action against, a social media troll. And Lord Pannick QC, one of the most successful barristers of his generation, discusses the lasting value of courtroom advocacy. Producer: Paul Connolly Researcher: Louise Byrne Sound: Andy Garratt Editor: Hugh Levinson