I think "subject to search" means that you should be prepared for it but it's not necessarily going to happen. When we were driving into the car park one year, in a convoy of three or four cars, I got pulled for search randomly, said to the security guy "Oh no, going to lose my friends" and he just waved me through. I wasn't trying to hide anything, just didn't want to lose the rest of the group!
I'm more concerned about the Sticklinch rules. We're only allowed to take in as much alcohol as we can carry. If we can carry it on a sack truck is that OK? It'll probably be one crate of lager and a box of wine!