I get how to do the percentages dependant on hours, but Im just wondering the best and easiest way to break it down if your hours have been quite variable. I know exactly how many hours Ive done for each week, but if I did, for example 15 hours in April, then 58 in August, so and so forth then should I actually just total my weekly hours and average it across the year, and then use that to figure out the percentages of water, gas etc. That would probably be better in terms of, when Ive done masses over 40 hours it would get accounted for and I could claim it back in real terms, but is it allowed? I hope that made sense!