There is a hillfort on Castle Hill. The earliest earthworks date to the late Bronze Age. More banks and ditches were added during the early Iron Age. Excavation has revealed that the Iron Age inhabitants caught fish and wild boar as well as herding cattle and sheep. There is also evidence of cultivation of barley and wheat. The fort appears to have been abandoned by the late Iron Age, the next occupants being Romans. A 2004 episode of the Channel 4 archaeological television programme "Time Team" focused on the Clumps. In 2004 Castle Hill was under excavation by Oxford Archaeology, and "Time Team" was charged with investigating the surrounding landscape to find any trace of activity that could be associated with the Clumps.