Hailsham is a town, a civil parish and the administrative centre of the Wealden district of East Sussex, England. It is mentioned in the Dom…Hailsham is a town, a civil parish and the administrative centre of the Wealden district of East Sussex, England. It is mentioned in the Domesday Book, where it is called Hamelesham. in one part, yet mentioned in another part of the same book as ‘’’Tilux’’’, the land of Ricard de Tunbrige. The town of Hailsham has a history of industry and agriculture.