Veeany
I agree with your comment about precautionary landings, clearly forced landings would also be covered.
What I am talking about is the necessity for the landowner to give the helicopter operator permission to land at a temporary landing site, i.e. one in operation for less than 28 days per year, assuming it is not in a congested area. Obviously, if it is in a congested area, then the CAA must give permission.
If there are exemptions for the EMS helicopters, then that removes the dilemma I thought may exist.