Where on earth do the power companies get their figures for estimated bills? Do they literally pull them out of the air?
I've just had an estimated bill from Scottish Power. It was staggering. To use that amount of gas I'd have to cremating bodies or running a waste incinerator.
They reckon I owe them £470. A quick look on my online account shows I'm £81 in credit. So, for 3 months gas supply that makes a discrepancy of £551!!!
Can anyone better that? Or answer where the hell they get these figures from?

