Letters from the Emergency Service Organisation: Derby Reconstruction Panel regarding "Invasion Precautions - Factory Immobilisation" Including - Letter and enclosures regarding the "Scheme for the passing of essential Military Information in relation to the Immobilization of Factories in the Derby Sector in the event of Invasion", Apr-Jun 1942, including Map of Derby showing the boundaries of the six sub sector groups with locations of the group headquarters - Specimen signatures of RMM Lamb, LW Culling and RA Mayes of No. 2 Group, Derby, with printed leaflet issued by the Ministry of Production, entitled "Industry and Invasion", the latter is marked as having been received on 7 Sep 1942 - Letter from the regarding factory mobilisation groups, 7 Dec 1943; with contact details of representatives in No. 4 Factory Group 17 Jun 1942-7 Dec 1943