Papers, 1868-1941, collected by the solicitors in the course of their work, mainly documents relating to the business of Wyndham Hewitt Limited of The Causeway, Staines and 9 Clement's Lane, Lombard Street, City of London; including letters patent and other documents relating to inventions for improvements in generating machines and extractor fans by Henry F. Joel; and business agreements between Wyndham Hewitt and other businesses including Lagonda Motors Limited.

This collection consists predominantly of notes, correspondence, press cuttings and printed matter on subjects such as British industries (including aviation, tin, steel, cotton and coal), prices and wages, restrictive practices, and economic development overseas. The collection also contains some personal papers including bank books and university notebooks.

Papers of Airwork Limited relating to Heston Aerodrome, comprising two annotated copies of a plan entitled 'Heston Aerodrome: Survey of land to be purchased by Airwork Ltd. April 5th 1935' and two annotated Ordnance Survey maps of the area.

Papers of Bernard Albert Hunn, 1949-[1982], relating to his career and research, including: copy of Hunn's degree certificate from King's College London, 1949; notes on elliptic functions, 1950; correspondence, 1951-1953, relating chiefly to the publication of scientific papers on aeronautics; reports from Hawker Aircraft Ltd design department, 1951-1953; technical papers and notes by Hunn, 1952-1956, relating to aeronautical mathematics; draft monograph by Hunn on 'Inertial guidance', 1964; correspondence, chiefly with James Allason, MP, concerning the British defence industry and world markets, 1964-1965; patent applications for 'improved guiding means for spinning missiles', 1959 and for a 'mind simulator' (an electronic model of the human mind), 1982, with essays and notes on the function of the human mind; photographs of a interlock relay system and of Revenue Systems component parts for a card payment system to be attached to a petrol pump; and memoir concerning Hunn's work in Nigeria, 1974-1978.