Substantial collection of papers relating mainly to the development of airbone radar systems for the RAF during the Second World War at the Telecommunications Research Establishment at Great Malvern and other loations. Includes numerous technical papers, working notebooks kept by Lovell, a diary of activities and discussions at TRE between 1943-1945, a scrapbook compiled during and after the war illustrating the development and use of ASV and H2S radar, and post-war correspondence concerning many aspects of wartime radar development.