Historian Tristram Hunt delves into the story of the biggest money counterfeiting operation in history, through its only surviving participant: 93-year-old Adolf Burger. For the last three years of the Second World War, 142 prisoners in the Sachsenhausen concentration camp, north of Berlin, were forced by their captors to forge millions of pounds-worth of British banknotes, which the Nazis planned to use to ruin Britain's wartime economy. Tristram learns more from historians and sees the original counterfeited notes, which are now held in the archives of the Bank of England.