Faulty meters are rare, It does sound like the bill is correct even though it is a high bill. We have had a cold quarter and as you have said you have had the heating on more over Christmas and then around 8 hours per day.

This along with an extremely inefficient boiler and two price increases will make the bill high.

Have you compared the amount of units used this year to last year?, I would also speak to E.ON again and ask for the consumption department, they will be able to give you further information on how the energy has been used and more economical ways for the future.

I know having a new boiler is expensive, but this could make you savings in the long term, have the current boiler type and list of appliances and what you use ready when you call.

Helena