I know I gave up looking for this stone the other week, and I'm not going to expend any more energy on actively looking for it, but it seems that the enquiries I made have been doing the rounds among a number of local interest groups. I was recently contacted by a member of The Devonshire Association regarding the Devonshire Oilstone, but unfortunately the news isn't good. The subject was raised at their last meeting, and no-one, (including the former keeper of mineralogy at The Natural History Museum), has ever heard of it. Later on this month there will be a meeting of the Devonshire Association Geology Section, and the question will be raised again, but I really don't think that it's likely I'll find out anything more.

Regards,
Alex