This is just a thought, but the question often crops up is there somewhere to camp near Liverpool, if any one on the Wirral knew of a handy location Bidson or any of the other places on the train route into Liverpool would make a good rally.
I know a place on the wirral on the bus route to Liverpool every half hour, it's big the size of 4rugby pitches plus some and flat, there's a 3day motorbike rally there soon, so shouldn't be a problem. Speaking to the organiser of the bike rally and he said you'll need to use the cricket club/rugby club clubhouse as that's part of the deal.
Dave