Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,902 pages of information and 225,312 images on early companies, their products and the people who designed and built them.
of Purley Way, Croydon, Surrey. Telephone: Thornton Heath 3211. Cables: "Instradio, Croydon"
1925 Radio Instruments, Ltd, of 12. Hyde-street, New-Oxford-street, London, , W.C. I , informs us that it has just appointed new representatives in the Northern district.
1936 The instrument manufacturing department of Radio Instruments Ltd, of Croydon, approved manufacturers to the Air Ministry and other Government departments, was acquired by Aeronautical and General Instruments. 
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Radio Apparatus. (Olympia, Ground Floor, Stand No. C.1539)