I've always thought this house was very efficient, thermally. Gas bills have been very low compared to my place in Cardiff. It seems SWALEC have made a huge fuck up. We've always had to dispute the meter reading whenever one of their meter readers called. Seems the meter no. on their PDA never matched the actual meter. Anyway, they were sending bills out assuming we have a newish metric meter [1] when we have an older imperial meter[2]. Hence they have been charging us 34.6% of the actual cost of the gas since August 2002. It seems they eventually twigged and sent a competent person out to check the meter. The latest bill has the correct meter no. and multiplies the units by 2.83 to get cubic meters. Fuckers backdated it to last October, presumably when they did the audit, and I'm now paying the actual cost of the gas. I haven't had any letters asking for the arrears so hopefully they have taken the hit for that as it was their fuck up. [1] 1 cubic meter per unit [2] 100 cubic feet per unit