William Forbes-Sempill

Date: 1921-1926 Reference: KV 2/871 (cover) Creator: Security Service Catalogue context: William Francis FORBES-SEMPILL, alias Lord SEMPILL, Master of SEMPILL: British. SEMPILL, an aeronautical engineer, served with distinction in the First World War in the Royal Flying Corps, Royal Naval Air Service and fledgling RAF, from which he retired in 1918. He remained involved in the aviation and aeronautical fields. From 1920 to 1923 he headed a civilian mission to Japan engaged in training Japanese aviators. He maintained close touch with Japanese missions and officials throughout the 1920s and 1930s. Before and during the war he was associated with a number of Fascist or semi-Fascist individuals and organisations, including 'Action', 'The Link', and the 'Constitutional Reform Association'. There is circumstantial evidence that in the1920s and 1930s Sempill passed sensitive military and technical information to the Japanese. For reasons touched on but not fully explained, Sempill was not prosecuted under the Official Secrets Acts, though this was seriously considered in 1925. On the evidence of th... Categories: Military Subjects: Air Force; Army; Asia; Conflict; Fascism; Navy; Operations, battles and campaigns Topics: British state and citizens; International trade and affairs; Military and war Period: Interwar Copyright information: Copyright clearance for publication is not required, except in the case of documents in third-party copyright. Usage terms: https://www.nationalarchives.gov.uk/documents/information-management/use-of-tna-materials.pdf