ps the bowser would probably be refused entry to airside at Gatwick as it is not a clear plastic container of 100ml or less...
...which reminds me of the true story of a water bowser driver who was told he couldn't bring his 500ml water bottle through, despite him pointing out to the security guard that he was driving 10,000lit of water about, how much difference was another 1/2lit going to make, what was the guard going to do about that?
He was eventually allowed through having decanted the water from his bottle into his 10,000lit tanker. Barmy or what?
TheOddOne