Jenty, my sixth winter with storage heaters coming up. You must think of a small heater to fall back on if power cuts. I have a small calor gas heater for this. The heaters have lost much of the heat come evening, I use an electric oil filled radiator in the living room and small hall .
I gave up adjusting the input after the first few weeks, the weather forecast is not that reliable when it comes to temperature for the following day !
So I suggest a non electric heater incase you have power cuts
An oil filled radiator for backing up heat in the evening
And if your flat is all electric, two thermos flasks filled up morning and night if weather is grim
Sorry not cheerful but it may be easier for you, I live in the Welsh mountains so need say no more
I also pay a set sum to the electricity company every month, come a harsh winter I can switch the lot on