I was delighted to be joined by James Rogers - a war historian, fellow of the London School of Economics, and presenter of History Hit's Untold History series. One of James' films explores HM Factory Gretna, a munitions factory built by the Ministry of Munitions in response to the Shell Crisis of 1915. He told me about the fate of these factory workers - predominantly women - who laboured to produce cordite, an explosive described by Sir Arthur Conan Doyle as 'Devil's Porridge'. We also discussed the overlooked story of German POWs in the south of England, and the legacy of their lives after the war.