How?
Do you have your heating and lights on all day?
In the depths of winter when I'd have heating for a few hours a day and obviously a lot of lights on etc, mine only ever went up to £70 ish
2 of us in a house, and £120/month average across the year.
Not sure how you can get it for £25/month average, or £70/month during peak winter, unless your house is freezing all the time, and you don't have hot showers.
did you not see my post I made in the winter about how cold my flat was but that I refused to put the heating on cuz I'm a tight fisted bastard lol