Established in 1904, traded, Graham St./City Rd., London, England (1920s-1940s), succeeded by BDH Chemicals Ltd. late 1960s then taken over by Merck Ltd (later Merck Eurolab) in 1973. 1960-1986: B D H CHEMICALS LIMITED; 1986-2002: BDH LIMITED; 2002-2007: MERCK Chemicals Ltd, Hull

Reg No.01232991: British Drug Houses Limited (THE), Merck House, Poole, incorporated 1975, dissolved 1997