The closure of Dartford's major employers: Seagers' Engineering Works, J & E Hall International, Vickers, the reduction and subsequent closure of Burroughs Wellcome (now GlaxoSmithKline), and the redevelopment of nearby Bexleyheath as a shopping town in the 1970s (and the more recent development of the Bluewater Shopping Centre), have had a negative effect on the economy of Dartford, but the town is still home to major brands such as Sainsbury's, W.H. Smiths, and Boots. With the opening of the major Bluewater regional shopping centre just outside the town, the high street has seen a growth in cheaper brands such as Primark and Wilko taking over empty premises. In the 1990s, the local economy was boosted by the establishment of a number of business parks in the area, the biggest being Crossways Business Park at the foot of the Queen Elizabeth II Bridge.