Helen Mark visits Coleshill in Oxfordshire to learn about its wartime secrets. In the early 1940s, with fear growing that Britain could be invaded by the German army, the estate became the training headquarters for a secret underground army. Thousands of countrymen - such as farmers, gamekeepers and foresters - were trained in the art of underground resistance. They lived outwardly ordinary lives, but their job would have been to spring into action in the event of invasion, disappearing into bunkers buried in the landscape and emerging to disrupt the invading army through sabotage and hand-to-hand combat
