Last winter, I experienced creaking noises from the pipes in my loft. It was when the weather was particularly cold. Is this doing any damage? If so, can I make any preventive moves? Also - should my heating be left on or off or on timer- if so what time should I put it on to keep the risk of freezing pipes without my heating bill going through the roof? Also Is there anything I can use to strengthen the joints to handle the expanding? In other words - any general info on this sort of thing that I can consider in the next few months before the next cold period.