Nope - they've done it before - in a Bedfordshire nature reserve where there was a one day festival. Got photos to prove it - subsequently used by Ashley.
I'm in Dundee on Saturday, otherwise I'd be there./
I think David is referring to the blurb which says it is a "one off" and "never to be repeated". Hence the quotation marks. Would love to go to this but it is the wrong part of the world for me.