clanjones has a good point. We do refer to UK campsites when we're in mainland Europe and they are very good, but their information depends on feedback and sometimes it's not current. We travel across Europe four times a year, always out of season, and we go to a lot of trouble to ensure that the various sites will be open when we arrive. A reliable comprehensive list would be useful to us, and not just for France.
We do want showers & toilets on site as, to keep ferry costs down, we have a sub-6m Elddis with limited space. We don't want made-up beds, we do want to cook real meals, and our shower/toilet becomes a storeroom that we could almost do without. Sites with good facilities are a must and we'd be more than willing to contribute what we have learned.