move the stones under cover of darkness
people do, he moves them back, people gave up.
Report him for obstructing the road?
It is a private road and he is parked on the bit that actually belongs to him BUT the legal rights (as treble-checked by our solicitor when we moved in) are that anyone with good reason is allowed access on foot and by motor vehicle.
To be honest 1 thru’ 7 I can live with, it is just ‘normal’ odd neighbourly behaviour. It was this morning’s episode that was more disturbing. He really did look like he had just/was just about to kill someone.