It's just basic GREED isn't it. What're they going to do next, charge you for looking in their direction from down the road? Oi we own all rights to this view! And what if you draw something they own? do they own that as well. pah
Well if you read further down, that the Picture Library has been 'hived' off to a commercial company, because the NT is a charitable trust??, there does seem to be some duplicity in the commercial world, (if not in the banking world) ;) bet Beatrix Potter's turning in her grave ....