Bristol-Siddeley Engines Limited was created from the merger of Bristol Aero Engines and Armstrong Siddeley Motors in 1958, and was based in Bristol, Filton and Coventry. By 1961 the company was designing and manufacturing aircraft piston engines, gas turbine engines, and propeller turbine engines; industrial and marine turbine engines; industrial, marine and rail traction diesel engines; cars; gas bearing compressors; beaver ball screws, ball ways and ball splines, and other engineering products. The business had 25,000 employees and was listed as a subsidiary of the Bristol Aeroplane Company and the Hawker Siddeley Group. In the same year it acquired de Havilland Engines and Blackburn Engines. In 1966 Bristol-Siddeley was acquired by Rolls-Royce.

Rolls-Royce Limited was established by Charles Rolls and Henry Royce in 1904. The company designed and built luxury cars and with the help of Henry Royce’s previous experience in building cranes, it soon gained widespread reputation for engineering excellence. During the First World War Rolls-Royce added building aero engines to its skills. This enabled them to later become involved in the development of jet engines. They worked engines for both the civilian and military market. However, a costly over-run in designing and building the RB211 civilian aircraft engine brought the company to financial ruin. Even though the RB211 proved a great success in 1971 the owners of the company entered voluntary liquidation. The government of the day bought the productive parts of the company which became known as Rolls-Royce (1971) Limited. Portions of the company were sold to British Aircraft Corporation and transferred the profitable car division to Rolls-Royce Motors Holdings Limited. In 1987 Rolls-Royce Ltd was privatised and subsequently became Rolls-Royce plc. The Rolls-Royce Motors brand was bought by BMW in 1998.

It has not been possible to identify the creator of the archive material described.