On the day Julian Assange is freed, we explore the story of WikiLeaks' unprecedented data releases, how he and the organisation changed the way journalists and newsrooms operate and how these releases ultimately led to his incarceration. Also in the programme, ITV's Julie Etchingham explains the secrets behind chairing prime ministerial debates and Steven Moffat, writer of new comedy drama Douglas is Cancelled, on why he's making journalism his subject.

Guests: Leila Nathoo, Political Correspondent, BBC; Dominic Wring, Professor of Political Communication, Loughborough University; Jonathan Munro, Deputy Director, BBC News; Julie Etchingham, journalist and moderator, ITV news; James Ball, Political Editor, The New European; Carrie DeCell, senior staff attorney, Knight First Amendment Institute at Columbia University; Katie Mark, Deputy Editor, The Bureau of Investigative Journalism; Steven Moffat, writer, Douglas is Cancelled.

Presenters: Katie Razzall & Ros Atkins