I know this doesn't help you at all and I'm all for keeping warm at this time of year.
I have been using storage heaters and a single gas fire for the last 25 years and am more than happy with the arrangement. We are both at home now all day and have not seen any major increase in fuel since finishing work. I've also thrown out my tumble drier and now put the washing on the rack at night and the following morning it's dry.
The house is toasty warm all night and until about 4 pm at which time I turn on the gas fire on low for the remainder of the evening. No maintenenance for the storeage heaters at all.
We use economy 7 for electricity.
Anyhow, I hope you manage a satisfactory solution.
Cheers
Lyv
If you don't like my principles, I've got others
Groucho Marx