To put that in context their estimate for December turned out to be only 6% higher than our actual use. Their estimate for January was 52% high than their estimate for December, and 88% higher than our actual use. I've gone through a series of months in which I've challenged their estimates, each time the meter readings have shown that I was right and they were wrong. in April I dug my heels in and raised a formal complaint, stated that I would not pay any bill based on a stupid estimate and suggested either a fixed monthly sum (I named a figure)