Hi,
Not totally sure on this information, as I have slept since then etc, but I was talking to a jounalist on my ferry over to Le Mans, and he mentioned something about a special enclosure for camping at Arnage corner. A VIP area or similar, but it cost an arm and a leg to camp there. Don't quote me on this but I recal something daft like £1000 or more.
I could e mail him and ask him more about it if you want to know for sure.
Regards
Chris