Lasting MarksLasting Marks is a 2018 essay film by Charlie Shackleton.SummaryPublished by The Guardian and narrated by Roland Jaggard, the film focuses on the British police's investigation into same-sex male sadomasochism in the 1980s.ProductionLasting Marks was a co-production with Academy Award-winning documentarian Laura Poitras's company Field of Vision, and based on Shackleton's own archival research.