If I've never heard of Priddy before, I doubt if ISIS or the South Wales branch of the EDL have.

Precautions against suicide bombings and psycho van drivers don't have a lot to do with tent thefts.

On a less criminal note, how safe are the gas bottles most campervan owners use? Do explosions often happen?

I see they're playing it really safe on their website - nothing on it gives you any clue as to where Priddy is. Maybe they have people out switching the roadsigns round the week before just to make sure.