Electric blanket on the sofa £20 from aldi - works wonders and I actually get too hot - costs about 2p per hour to run. I only turn central heating on to 15 degrees for about an hour just to take the edge off. my bills haven't been too bad at all. My highest bill (combined elec and gas) was £140 in December, less the £67 from the govt so £73. I work from home 3 days a week too.