Car Park 2004 clarification

Now that I have got my new ACO membership info, I have to book the tickets and car parking. I have had a look on the website but i am a little confused. Like the last few years, I wish to book a ticket for Bleu Car park. However last year they asked us at the gate if we were going to pitch tents and then charged us a supplement.

The website for this year says that a special "Bivouac" area will be tolerated in the Parc Bleu. The supplement must be paid directly to the controller on the gate. Which is what we did last year.

However listed on the website under the Lay Bay / Car Parks section I have a choice of

Blue Park Camping Car at 36 Euros or
Bleu Park Car at 18 Euros

Are these one and the same but the 36 Euros one you have already paid the suppliment, or is the Blue Camping Car , actually the Blue Camping area next to the car park. If this is the case I find it strange to that this is still offered as it is normally fully booked by this time of year. Also why are they listing it under car parks if its a camping area.

Can anyone shed any light on this before i book my tickets please. Thanks