A while ago we started the ball rolling on a change of electricity supplier - after what feels like a month we've just had the last bill from the previous supplier. The shocker came when we noticed there was over a 3MW/hr difference in the bills they'd been estimating and the real value. So if your thinking of changing supplier it might be worth adding up the difference between the billed and charged amounts . (Yes we was expecting it but its still a bit of a shock when it lands on the mat). ChrisB.