Gwennap, Cornwall
Gwennap was once a thriving mining town; worth an estimated £10,000,000 as far back as the 19th century. By the end of the 20thC all mining in the area had ceased.
During the 18thC the town gained fame as huge crowds gathered in the Gwennap Pit (photo) to listen to John Wesley preaching on Methodism. His diary records his visits to the town.
Resources
Chapman County Code (for Cornwall) : CON (complete list of codes)