This collection forms part of the Operational Research and Operational Research Society Archive (MSS.335), which was deposited with the Centre by operational research practitioners.
The archive has been catalogued to file level. A copy of this catalogue is available in electronic format, and in paper format in the Centre's searchroom, at the National Register of Archives in London and in Chadwyck-Healey's National Inventory of Documentary Sources.
The numbering system used by British Gas for the reports and notes has been incorporated into the Centre's reference numbers and represents the year of the report and the item number, e.g. MSS. 335/GA/4/1/68/23 is for report number 23 written in 1968.
The archive comprises the minutes of the Operational Research Committee of the Gas Council, 1970-1994; reports and notes on projects, many by the North Thames Gas Board, 1966-1994; the Operational Research Digest, 1971-1994.