Years ago we gave away a small greenhouse "you dismantle and transport". A rather odd couple turned up in a Discovery towing a trailer with a son in his 20s who seemed a bit spaced out. We dismantled the greenhouse and loaded it in their trailer (just stacked the glass, I wonder how much got broken?) then invited them in for tea. Gradually it began to emerge that they were survivalists living in a fortified farm at a place called Keelham Heights that ColinJ will know. I went to get my trusty map and the son was astonished to know that a map existed and that his house was on it. As we looked over the map I began to sense an odd atmosphere, which turned odder when I suggested we might drive up and inspect the rebuilt greenhouse. They said nothing to encourage me and left. Weeks later I drove up the track in my Landy, to find a Pennine farm barely visible above a huge earth berm with massive steel gates and a sign saying: "Visitors, sound horn and wait. If nobody comes please leave." Nobody came so I left. Weird folk altogether.