 Though its popularity as a spa town waned with the advent of sea bathing, the town remains highly popular and derives some 30 per cent of its income from the tourist industry.The town has a population of around 56,500, and is the administrative centre of Tunbridge Wells Borough and the parliamentary constituency of Tunbridge Wells.Evidence suggests that Iron Age people farmed the fields and mined the iron-rich rocks in the Tunbridge Wells area, and excavations in 1940 and 1957–61 by James Money at High Rocks uncovered the remains of a defensive hill-fort.