1936 part of Dyestuffs division devoted to medicine; 1942 - ICI (Pharmaceuticals) Ltd subsidary company; 1957 Pharmaceutical division and ICI (Pharmaceuticals) Ltd moved out of Dyestuff division and redefined as an independent division based at Alderley Park, Macclesfield, Cheshire - Parent company ICI plc; 1993 demerged from ICI plc and part of Zeneca plc and became known as Zeneca Pharmaceticals plc; 1998 merged with Astra became AstraZeneca Pharmaceuticals Limited.