Only a memory, nothing guaranteed: flying in is not allowed. They used to have an arrangement with a (more or less) nearby aerodrome, but I can't find such a mention on their website this year.
Consulting their website, I did find the whole thing rather expensive! But it must be their major source of income, and the money will be well spent. Better this than the fate of the Avro Vulcan.
PS there is a mention of "camping places near the aerodrome" which is an AIP's way of stating that camping "sur les lieux" is not allowed.