I'm in the same boat Petra...small village, no mains gas, 3 night storage heaters that take £4 off my leccy key at night, just to be almost cold again by the time I get home from work (even with the vents shut), so I don't bother!
Have a small halogen heater for if it's really cold (half hour warms the room up), lots of blankets, warm clothes, slippers and a hotwater bottle.
Managed so far, and very seldom get a cold...if I do have some sniffles, it's only for a day or two, and not severe.
Have to say, used to be in a centrally-heated house, but wouldn't go back to it...my health, and particularly my asthma, have been much better since I moved to this place...weird, but true! 