We've used some of the CCP sites, and they are fine. But what really annoys me about them is that you can book in advance (provided you pay for premium membership
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The whole ethos of aires for me is just turn up and hope to get on. We went to Noirmoutier last year, and the aire we expected to visit had been taken over by CCP. The electronic noticeboard outside said there were (20?) free spaces, but the barrier wouldn't open to let us in. A French motorhomer said it was because the spaces had been reserved.
However. We parked on the original aire area (which was massive) along with about 60 other vans. Now, this is where you can draw positive comparisons with the UK, because the next morning a police officer knocked on the door. She explained we shouldn't have stayed overnight, but not to worry because there would be no fine. We should feel free to spend the day, visit the local area and enjoy our visit; just not stay there a second night.
And people wonder why we don't holiday more in the UK ...