Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,103 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
of 16-47 Cross Street, Hatton Garden, London, EC1 Telephone: Holborn 4884-5. (1929)
of 4 Iddesleigh House, Caxton Street, London, SW1. (1937)
of 10 Princes Street, Westminster, London, SW1. Telephone: Abbey 3833. Cables: "Monazite, Parl London". (1947)
1929 British Industries Fair Advert for Rare Earth Compounds and Metallic Elements used in the Incandescent Mantle Trade. Salts used in the Glass and Textile Industries. Mesothorium Bromide for Medicinal and Scientific use. Thorium**, Cerium, Didymium Nitrates. (Chemicals etc. Section - Stand Nos. K.94 and K.101) 
1937 Mesothorium producers. 
1947 Listed Exhibitor - British Industries Fair. Producers of Rare Earth Chemicals. Compounds of Thorium, Cerium, Lanthanum, Didymium, Samarium. Radioactive Luminous Compounds for Dials of Clocks, Watches and Scientific Instruments. "Cerirouge" the New Polishing Powder for Optical Glass. (Olympia, Ground Floor, stand No. A.1246) 
The factory occupied by Thorium Ltd was demolished some time ago, and 10,000 tonnes of contaminated material from the factory had to be dumped at sea.