Well the local museum expressed an interest, so I dropped of a sample of the burnt stuff, and got a pretty quick reply referring me to the Heritage Division of Kent County Council, who are going to arrange a site visit with me, and have told me I can participate in the dig if it needs one*. It could mean, according to the guy I spoke to, the saving of the quarry as it is, which would be grand as it's full of wildlife and a great, though illegal, place to walk dogs and horses.

*That was only when I mentioned that I make great tea...