Streets in the Sky

Series charting the development of the conservation movement in Britain since the Second World War. Architecture critic Tom Dyckhoff visits the most controversial listed building in Britain: the Park Hill flats in Sheffield. Although it was once heralded as the most pioneering public housing scheme in Britain, decades of decline and neglect have transformed it into a grim sink estate. Now it's protected by English Heritage and raises questions about what we should be saving for the nation.