Hi - My comment would be that we are British, and prefer to do our caravanning in France or elsewhere in Europe. We do occasionally have weekends in Britain, but it just isn't the same for us!
In France, generally, you can still do what caravans were intended for - tour - going where you please, when you please and staying as long or as little as you want! In Britain you have to decide weeks or even months in advance if you want to go somewhere, then try to book a pitch (which can be impossible for popular weekends on popular sites). You may have to vacate your pitch at the weekend, because it has been pre-booked by someone just for Friday and Saturday night! The traffic precludes against your getting there on time, and when you do the weather can be awful! Even being a member of the Caravan Club or Camping and Caravanning Clubs doesn't really make it easier to find a site, as people on here will testify. You can perhaps almost always find a CLs or CSs (the Caravan Club and Caravan and Camping Club licensed sites) but these are basic sites, often just a field, sometimes with no sanitary facilities or electric hook-up and sometimes with the only 'facility' being a cold water tap and a chemical loo emptying point! This is not our sort of caravanning.
Costwise, municipal sites, and the discount schemes such as Camping Cheques, ACSI Card, and the like make it possible to tour in France on a very limited budget - like ours. The ACSI card will get you a pitch on a four star site for 11, 13 or 15 euros, or with Camping Cheques £13.95 per night for two people, car and caravan (or motorhome or tent), awning, electricity and one dog. If you stay for any length of time then sites give you a discount - in Britain on some sites you are limited to a maximum of twenty-eight days and then have to move on! Where the ACSI card or Camping Cheques are accepted in Britain campsites often exclude weekends, or any dates during any of the school holidays, where in Europe both are accepted widely during these times. I think those people who use CLs and CSs (the Caravan Club and Caravan and Camping Club licensed sites) can find sites at this sort of price but most commercial sites charge a lot more, and their peak season is considerably longer than in Europe, when outside mid-July to mid-August you can often use these discounts. We don't use toll roads in Britain or France (budgetary constraints!) but in France, for some people, they are certainly worthwhile. They get you quickly to your destination, have caravan-friendly places to stop for a comfort stop, and are free-flowing for the most part except for the real peak weekends.
It would be great if Britain had municipal sites - but I think it's very unlikely. Even in France those in very rural areas (ie not adjacent to major routes where sites are still well-used) are closing down. A contributor to another forum used only municipal sites in France - and had a great time, at very little cost, but did find that he was the only outfit on some sites and that was during peak season of July/August.
We've been camping and caravanning in France for thirty-one years now, and still go back twice each year and find new sites, and new things to see and do. We did camp in Britain in our teens and twenties, and again when our children were small - but these days much prefer the freedom we get in Europe.
You can quote me - if there is anything worth quoting!