TEA: A dark history. Laurie Taylor talks to the historian, Seren Charrington-Hollins, about the exploitation, wars & intrigue at the heart of the history of that most 'British' hot beverage. Also, Sarah Besky, Associate Professor in the Departments of International and Comparative Labour & Labour Relations, Law, and History in at Cornell University, discusses her study of mass market black tea, one of the world’s most recognized commodities, and one which is still rooted in the colonial plantation. Producer: Jayne Egerton