And it appears that I overpayed just a little last month.
My actual meter reading as of today (for both meters) are actually lower than the estimated readings Scottish Hydro Electric gave me last quarter.
I wasn't able to check them last time as I was in Nigeria, so just payed the bills (thank god for the RBS Bill Management service or I would have had several nasty red letters to contend with then I got home).
I guess I'm not using as much electricity as I thought, which is good, I might even turn the heating up a little bit as a result