Not sure if this link has appeared but it relates to Jamie's swallets on the Mendips, Jodie Lewis (Capra) http://capra.group.shef.ac.uk/2/upwards.html.
Given that the Mendips is a fascinating place with caves.swallets, gorges and underground river/s, there seems to be evidence of deposition of an axe, etc in the Brimble swallet. Similar to the shaft on Martin Green's Down farm, which is mentioned in the concluding paragraph....