I have never seen Petit Houx on a map before. I am not sure what it was called before but it dont think it has ever been used for camping, just a car park. The map suggests its now a camping area I think.
I think it may be a bit chaotic this year, the road system will have changed around the site with only one entrance, on the plus side it looks more secure.
Good luck finding a new spot Rob. I think you will have the pick of the site when you arrive, you should be there when they open the gates assuming you don't take too long driving there! Hope the loos are all plugged in.
I am pretty sure when we go back next year we will be either 'of site' or another area anyway, been on the annexe for about 10 years, so its time for a change.