Correspondents on defence inventions and suggestions from the general public include: Oliver Lyttelton [later 1st Lord Chandos] on the mobilization of the Territorial Army anti-aircraft units; Norman Meeres [Assistant Principal, Air Ministry]; Harold Balfour [Parliamentary Under-Secretary of State for Air] on subjects including the risks of establishing an air base in the Netherlands (2); Sir Edward Marsh; Lawrence Burgis, Committee of Imperial Defence (2); 1st Lord Woolton [earlier Frederick Marquis], Honorary Adviser on Textiles and Clothing Production [Ministry of Supply].Other subjects include: munitions and engineering inventions; ARP shutters; lessons from the sinking the submarine Thetis; Ministry of Supply clothing contracts; requests for interviews with WSC; air defence; flooding German trenches; searchlight developments.Also includes: notes and copies of correspondence by WSC's secretaries, including Mary Penman.