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Thanks all. I dont think there are any tanks, hot or cold left in the loft. dont go up there often. Our house built in 1938. I remember there was never a top on the cold tank . We had to cover it and lag it ourselves and Im pretty sure its not there now. I would have to move loads of junk to see. I only go up at Xmas to get the decs out, I will have a look then, but providing there isnt, Im presuming then, thats its safe to drink from bathroom tap. Thanks