He needs a license and signs before he can even THINK about clamping as it is regulated now, if the cart park is at a little chef ONLY, he is within his rights to ask you to move.
However if you do not move it is a CIVIL Offence not one of trespass, as you did not have to go through any gated access and moved nothing out of the way to gain entry, I had this almost every week with the MOD police, proved my case about PRIVATE PROPERTY access now they don't bother, jesus I was only taking piccies of aircraft.
For any place to be IN LAW PRIVATE, there has to be PHYSICAL barriers, gates fence etc there for at least 24 consecutive hours in every year, private property signs in law have no meaning unless you have to remove something blocking your way such as a gate etc.
tabetha