As I understand it (and I may be wrong), you can land or take off anywhere you like provided you:
Have the permission of the landowner.
Inform the local police that you intend using a particular piece of land for takeoff and landing
provided:-
It is not in controlled airspace and hence needs permission from the controlling authority in the form of a Letter of Agreement.
You do not intend to use it on more than 28 occasions per year.(To use it more often requires permission from the local planning authority.)