Yes Chris, but it irks me that the energy companies always err on the side of taking too much from us each month - look how many of those whose energy companies have recently gone bust were in significant credit, and worried what would happen to that money. I know it's protected, but the energy companies must make a lot from all that cash sitting in their accounts.
It was oh so much easier when I could phone in my readings every 90 days (as I did, religiously) and generate a bill that I would then be paid by direct debit, so I was always up-to-date. With the horrible monthly system you're always behind or ahead. I like to know that I've paid what I owe!