Comprises:
- A1, Diary by John Aris of a visit to the USA with John and Muriel Simmons and A.K. George Robey of J. Lyons, 1963.
- A2, Contributions submitted for the book User-Driven Innovation but not used in it, various authors, 1990s.
- A3, Summary of visits made by D.T. Caminer and J.M.M. Pinkerton during visit to USA, March/April 1958.
- A4, LEO chronicle, supplement 1955-1961, includes letter to John Aris from Tommy, 1975.
- A5, Peter Bird, LEO - the pride of Lyons, British Journal of Administrative Management, 1990-1991.
- A6, File, containing British Journal of Administrative Management, 75th Anniversary Issue (includes O & M and Simmons), November 1991, Simmons, the visionary, British Journal of Administrative Management April 1991, and Conversation: J.M.M. Pinkerton, Annals of the History of Computing 5 (1), January 1983.
- A7, LEO Computers, a draft historical account based on interviews with Salmon, Simmons and Stevens and published work, by D.J. Richardson, 1974;
- A8, LEO Chronicle, a listing of important events 1947-1961;
- A9, Correspondence between Peter Bird and various LEO people and LEO users, collected in preparation of LEO: The First Business Computer. Correspondents are as follows:
- Leo Fantl.
- B.V.J. Healey.
- John Hall.
- T. Carroll.
- Peter Roddam.
- A.M. Morgan.
- Peter Dick.
- R.S. Logan (Ravenscraig steel).
- Ing. Josef Prerost and Jiri Petru (Nova Hut, Czechoslovakia).
- H.I.A. Archibald (British Steel, Teesside).
- Robert Bender (Tubemakers, Australia).
- Michael Miller (British Telecom, re T.H. Flowers, includes copy of Flowers' paper on history electronic switching and exchanges).
- A.J. Smith (British Telecom).
- Malcolm O'Neill (British Telecom).
- Peter Lain (Shell, Australia).
- Bryan Clark (Shell UK).
- E.J. Ferrier (rayon).
- Ministry of Defence (re computers at the four dockyards; Rosyth, Portsmouth, Devonport, Chatham);
- M.J. Wood (Meteorological Office. Includes article by Mavis Hinds on history of Met Office computerisation);
- Colin Boast (DHSS, Newcastle).
- Customs & Excise.
- W. Mack (Royal Bank of Scotland).
- F. Hardy and Peter Murton (Colonial Mutual).
- Allan Thompson (Renold).
- H.A. Gracie (Coventry Gauge).
- M.A. Clversley (Wayne Kerr).
- Ilford Ltd;
- Smiths Industries.
- Ford Motor Company Ltd.
- David Sadler (ICL).
- A. Clark (Sun Alliance).
- Sysop Ltd.
- Troy Systems Ltd.
- Freemans Ltd.
- Courtaulds.
- Julian Edwards (Dataflow Corporation Ltd).
- Michael Pinches (ex-Ministry of Pensions and National Insurance).
- Robin Jackson (ex-British Oxygen).
- David Edwards (ex-RAF).
- R.S. Goble (Lucas).
- R.J. Harman (Kodak);
- Elwyn Rees (ex-W.D. and H.O. Wills).
- A10, Samples of Lyons Cakes delivery notes, using LEO system, 1964.