Peter Brown, author of “The Vanishing River of Box Hill” gave us a talk last Saturday on swallow holes and the River Mole. He used historical images and LIDAR topographical maps to illustrate his talk on this interestingly mysterious subject.  The talk was given on Zoom and recorded.  If any member of the Friends of Box Hill would like to see the talk then a link is available.  Please contact us via the Contact page of the website if you would like to receive the link.