i have just recieved a gas bill from bg for £380 who say that over a 63 day period i used 1080 units, the amount of units is correct as per meter and the meter readings are correct. My problem is this for a 26 day period just before this bill i used 45 units, i have been reading the meter on a daily basis since and am only using maybe 3 units per day.I found bills from last year and only used 615 units in 306 days.can anyone tell me if there is a problem with potterton puma 100e which would make it use excessive amounts of gas and then rectify itself and go to reasonable usage many thanks