Haven't been to that site, but done Keycamp/Canvas. We try to budget for a couple of meals out/pizza takeaways etc, then do the rest self catering. Family of 7 so need decent stuff to cook with, the pots and pans are a bit crap very basic, learnt the hard way, so we take our big pasta pan which is a godsend, and beauclaire bbq. We have a big car and roof box so I just do a box of stuff, depends on what space you have but it is worth the hassle of taking ime. We take pretty much as per cheerup's post plus kitchen knives are always rubbish so I take one, oven glove, wash tabs, kitchen towel, big plastic jug for water with meals and basic cooking/cleaning staples. Just to say we have found the range of cereal very minimal and expensive and so is squash (they don't really do squash), so we load up with both (x5 kids for x2 weeks
), we buy loads of cheap water at the supermarkets, but my kids still like squash, esp if really hot. Everything else we just buy fresh there.
For the car, you are supposed to have originals of reg and ins docs, but we always carried copies, by law must have a warning triangle and high vis jacket and advised to carry spare headlight bulbs, you might know this but may help.
We've been doing France, mainly south and Italy every year or two since kids were born and got to 2 or 3, eldest now 16.5, with own caravan or sometimes Canvas. Majority of people think we are brave deranged to do it, but we have just had the most brilliant hols, stayed in some fab campsites, met lovely people and have great memories, so have fun! Really hoping to get away this year if circs/funds allow.