1936 - Medicine section established in ICI LTD Dyestuffs division; 1942 Imperial Company (Pharmaceuticals) Limited formed as an independent subsidary of Dyestuff division; 1957 - Pharmaceutical Division formed and based in Alderley, Macclesfield, Cheshire, England; 1990 - demerged from ICI with agro-chemicals and specialty to form a new wholly owned and independent subsidary company Zeneca Plc - pharmaceuticals became Zeneca Pharmaceutical Ltd; 1998-merged with Astra of Sweden and became AstraZeneca Pharmaceutical Ltd