This book visits the Situationist International¿s influence and afterlives in Britain, from the arrival of Surrealism to Britain, to countercultures of the 50s and 60s, to current directions in Situationist theory and practice. It visits materials including newspaper reports, underground pamphlets, Psychogeographical films, and experimental novels. Cooper brings to light an overlooked period of British avant-garde practice, demonstrating how this subterranean activity helps us to understand postwar culture, late modernism, and the internationalization of the avant-garde. This book offers a vital contribution to the international history of the avant-garde, Surrealism, and Modernism.