TrevorP
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Thanks for replies, it sounds like pipes banging together, have found two in boiler area, and separated, but still it happens. Def not CH as this happens throughout the night when nothing at all is being used. Have managed to turn stop cock, which was fully opened, and closed to within one turn open, just to see if this helps, will have to wait a bit to see if any success. Will keep you posted. Thanks again
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