Hi all, first time abroad next year. Will be going in school holidays from the 9th to 25th August. How easy is it to get overnight sites. Do you have to book in advance or just turn up> We favour as much flexibility as poss and just go with the flow... And, if booked up solid, can you pop in to sites during the day and use their toliet disposal facilities? Sorry for dumb questions.. PS, plan is to go Hook of Holland, Holland, Belgium, Lux and retrun via calais.