On a small farm to the north-west, South Tadworth Farm, directly at the top of the westward-facing Langley Vale and south of the Epsom Downs racecourse, is an Iron Age Banjo enclosure, a term used by archaeologists for a distinctive type of prehistoric settlement. They were mostly constructed and used during the Middle Iron Age (400-100 BC), although some remained in use up to the time of the Roman Conquest (43 AD).