Jayland - I suspect that is "just your opinion" rather than based in anything you know to be law - please correct me if I am wrong.
The actual answer is ...... Yes you can. There is specific law (the Air Navigation Order) with which a civilian pilot must comply, and it does not prevent me flying at 5ft over a field. Military pilots are less constrained than a civilian pilot. (Note: I do not fly like that as I have no need to do so, nor training to enable me to do so safely - but I would break no law if I did).
Landing - as a civilian pilot I should have the landowner's permission to land. That is not always possible - as a colleague demonstrated when he landed a helicopter on a playing field in central London because he became concerned at the continued airworthyness of the aircraft.