this is just a thought , what happens if some one's caravan caught fire and then set yours onfire ,and they wasnt insured ,and then they refused to give you there details the people who run the site are under no obligation to give the offending persons name or address ,thats if they have that persons address ,and its no good taking there car registration No ,some people that i have met in the past are driving about with no documentation what so ever ,they havent even past a driving test ,i mean when you pitch up you dont know who your neighbours are ,whats to stop a person booking a site under a false name & paying cash and causing mayhem when they get there ,perhaps it might be good idea for organisations to get there members to register there insurance details when they join