You must be mad to use npower as your supplier. They over charged me for months resulting in a £350 over payment when I asked for it back they said their using it to pay off future bills. When I got my bill (two weeks later) they said they made a mistake and underestimated my readings although I kept them up to date with regular readings. They are blatantly trying to rip me off by changing their own readings. I am now switching my electric supplier and passing my case to the ombudsmen. If your with NPOWER check your bill and then swap Krissy Very annoyed ex npower customer