I think that the phrase used was 'often with the landowners permission'.
And often the landowners have no idea of the sensitivity of a historical site. It is often a 'pile of bloody stones that stops me ploughing in a straight line'.
If the landowner has given permission then you are quite right it is not litter. I can't see the likes of National Heritage or the Parks authorities or the Forrestry Commision giving permission for you to leave things anywhere on there land.
|