@revk I've never understood how energy suppliers manage to make simple calculations so hard to follow. I've previously spent ages trying to figure out why my accounts don't match the supplier's statement, only to find out that its because they quietly replaced an old statement (same dates, different figures). Luckily I had already downloaded it so I could compare the old and new PDFs for that date (shouldn't changing a statement after you've issued it be illegal?)

@steve The way they all seem to handle "corrections" is weird. I have had one company re-bill for 3 months, showing my payments against it, and so a balance now due. If they had just done a credit and invoice for the specific bit they were "correcting" it would have made a lot more sense. Normal VAT rules do not allow the shit they pull, but I assume they get away with it with consumers.