I have felt like that many times, anyone's animals can get out but some folk don't care or make an effort to keep their animals in, even if this farmer is doing something to his hedge or fence how long would it take to move the sheep to another field or put up an electric fenceI dont really want to get in to all that, I would just be happy with the sheep gone
sounds to me like they are short of grass and he is happy to let the sheep find it where they can