We are off to France next week and have booked our main site in the Lot. However, after reading posts on aires we have decided to make two overnight stops, one at Abbeville and the other at Salbris. I have e-mailed both sites to ask for a booking but the first site hasn't responded and the second sites e-mail bounced back. Given that this is the busiest weekend for caravanners in France do we need to make a booking or can we just turn up?