At this festival, tents are to be pitched & cars parked in a car park.
Some people decide not to do this & he has to check tents to see if cars get hidden in them, yes, people do in fact try to hide their cars in their tents.
It is a major fire risk.
Here's a photo of his that of him finding a hidden car at the event a few years ago.
, just to avoid leaving it in the carpark. Crazy.
