Ground Force! Charlie Dimmock will make the Swallowhead into a water feature complete with lights and a little cherub fountain while Tommy builds a pergular atop Silbury Hill itself to hide the hole. If you play you cards righht you could get old Titchmarsh back for a one off special so that he can plant up the West Kennet Avenue.

Time team will excavate all the soil around the hole and leave the bare hole so we can scan it's shape.
Monday morning Mark Horton will fly over the hole and take great air pics from the floppychopter and tuesday the local archaoes can pat each other on the backs and the locals will foot the bill.
PeteG