I'm wondering if someone will explain to me the procedures on booking into a site, Do you phone in advance and get your credit card out over the phone and pay in advance or do you just arrive and get sited if there's a spare stand available? What if you wanted to stay up to three weeks in places, would you need to pay for 21 days in advance or can you pay a day at a time like you can do with a mobile phone (Pay As You Go)??