As interesting two-page note about the necessity to continue production during air raids. Initially, as intruder aircraft flew towards their targets, sirens would sound and all production would cease as employees heeded to the shelters. This would cause immense loss of production. To tackle the issue, the Department for Home Security issued this pamphlet advising on measures to mitigate against always sending people to the shelters.
News about interesting insignia, ARP related info and period photos that turn up.