Hi
we don't have the huge wilderness areas that you have in the states that you can go wheelin' on
private land is turned into off road sites, that's what we call pay and play. some sites are quite small, just a few acres, some old quarrys are much much bigger.
But we have nothing like Moab

. Any areas that size in the UK are usually national parks, no off roading allowed...
Cheers
Nick