The GPO Film Unit Collection: Volume 3 - If War Should Come DVD (2009) cert E Title: The GPO Film Unit Collection: Volume 3 - If War Should Come Format: DVD / Normal Type: DVD Studio / Publisher: Trinity Creative Partnership UK Release Date: 06 Jul 2009 A selection of restored vintage shorts made for theatrical release, originally produced by the GPO Film Unit shortly before the outbreak of World War II in September 1939. The shorts explain the civil defence precautions to be followed by householders in the event of war and were designed to instil calm and restore confidence at a time of great anxiety and concern.