General Correspondence and Papers: Correspondence with David Lloyd George, Prime Minister and Arthur Balfour, Lord President of the Council on Washington Conference on naval armaments; Air Marshal Sir Hugh Trenchard (2) on the Naval Air Service and Admiralty-Air Ministry relations; Sir Maurice Hankey, Secretary, CID (3); Admiral of the Fleet Lord Beatty on naval aviation; memo by WSC on "The Air Force in Relation to the Army and Navy".