b) it is within a distance of 1 kilometre from the perimeter of a scheduled monument and is 15 metres or more in height, or has an area of 0.2 hectares or more
(b) ei fod o fewn pellter o 1 cilomedr o berimedr heneb gofrestredig a bod ei uchder yn 15 o fetrau neu ragor, neu fod ei arwynebedd yn 0.2 hectar neu ragor