I am having problems with leisure battery so at the moment have been on sites using mains hook up. The other week looked like due for thunder and lightning in the area and I noticed next door removing his hook up from the power point. When speaking to him he suggested that the van would be ok as it was a Faraday cage (heard about that fellow) but by connecting to the power point I was in effect negating this. Decided it was safer to go read a book in my panel van that stand around on wet grass holding a long length of electrical cable. But now he has got me thinking is it true and should I disconnect the electrical? He was in a caravan and I was going to point out the fact that the metal corner stays were down but decided to let it pass.