This is an interesting story and the first I've heard about Uri Geller in quite a few years. It seems that at £30,000 he got a bargain as the current owner originally wanted £75,000. In today's financial climate and with interests rates almost zilch, his money is now 'rock-solid' - sounds like a good investment to me.
I found some images of The Lamb and whilst not exactly pyramid shaped it is 'mound like', uninhabitable, and being a Site of Special Scientific interest very unlikely to ever get planning permission for even a shed.
You probably already know Moss, it is flanked by two 'sheep dogs', North and South Dog Islands.