hi Lisarevill21,
Minor is correct to point out that storage heaters are not the cheapest form of heating but unless its your own flat and you have the capital to install a gas central heating system I guess you are probably stuck with the storage heaters. Of course we electric heating users might be laughing when the gas has run out and we are warming ourselves with cheap nuclear electricity ;-)
I do think your bills could be way off based on your description of use. I too have storage heaters in a largish 3 bedroom house totally electrically powered except for 1 gas fire in the living room. I run everything possible on cheap (night) rate, space and water heating and washing machine. 2007 quarterly consumption was:
Q1 1171 day units 5205 night units = £373
Q2 466 day units 1989 night units = £273
Q3 552 day units 664 night units = £110
Q4 1100 day units 3149 night units = £256
The one (inefficient) gas fire consumes about £185 of gas per annum.
I hope these figures are helpful.
Energy use obviously does depend on heat losses and if your flat is poorly insulated and draughty then you could use much more than I do in my well insulated and draught sealed house.
I also fell foul of the swapped rates mentioned in a reply to your post. E.on sent me a bill for the 2008 first quarter for £759.90. I rang them to advise that they had swapped the day and night rates but the surly and arrogant call centre person "Colin" refused to believe me and said they could only believe that if I had actualy checked the readings myself for a period of not less than 2 hours that day. I pointed him to our regular pattern of bills over several years but he just wasn't interested.
The meter itself normaly indicates which rate is being used either by a pointer on the old dial meters or by a message on the digital display on the newer meters. My digital meter shows R1 for day rate and R4 for night rate.
I called again and got someone helpful who looked at our previous bills and arranged for a replacement bill for £336.32 to be issued.
This raises the problem of direct debit. I cannot get a cheaper rate unless I agree to direct debit. I am not willing to allow E.on to take any amount they think fit from my account. The mistake they made this last quarter would have pushed my account overdrawn and incurred bank charges and I am confident that E.on would be slow to make a refund.