Squatting: Laurie Taylor discusses the first popular history of squatting in Europe and North America. Alexander Vasudevan, Associate Professor of Human Geography at the University of Oxford, drew on extensive archival research to retrace alternative forms of housing from Copenhagen's Christiana 'Free Town' to the Lower East Side of Manhattan. He's joined by Lucy Finchett-Maddock, Lecturer in Law at the University of Sussex

Also: 'Streaking', 'mooning' and 'flashing'. Barbara Brownie, Senior Lecturer in Visual Communication at the University of Hertfordshire, explores the many meanings of public disrobement, from the playful to the criminal.

Producer: Alice Bloch.