One of the neighbour's to my parents farm have wanted to buy a piece of land that sits between their house and one of the farm buildings. We are keen to keep it as expect them to sell at some point and it provides a bit of space between there house and the back of the building. They are now trying blackmail saying the building which is used for storage and shearing in the summer and to hold ewes for lambing in the winter is too close to their house. The building is over 20years old and previous farm building predate this. Am I right in stating that the often touted 400m rule is only applicable for gaining planing permission for new buildings? There daughter has just joined a solicitors and I think they are trying to be clever!