The best one I saw was (and it's probably still for sale) a beautiful old engine house. The story goes that it's come onto the Market after the old chap, bit of a recluse, died. The family just wanted it sold. Initially it was £350,00.00 but it did drop but nit by much. 2 bedroom. So I was looking at the details online and I thought - very pretty but where is the mine shaft.
Mentioned it to a friend of mine and she said "omg we went to view it (richer than us then) and it's beautiful but we contacted the mine reference organisation (forget the name ATM) and asked whT type of mine was it, copper, tin, arsenic .... She said the phone went quiet and there was some mumbling and the chap came back with this "oh wow that's quite a historic mine that - it's one of the ones Marie Curie used to get her uranium from." - nuff said.
She spoke to the estate agent who suddenly had his memory return to him "well that's nothing to worry about let me assure you. In fact it's so unimportant it slipped my mind what type of mine it was. But dont worry they removed a meter of topsoil all around it years ago. When they built RAF St Mawgan (Newquay airport). And they put it all in the footings of that." His words not mine. So that's "dispersed it everywhere around there somewhere" maybe, perhaps.