In reply to ollieollie: We have got some new storage heaters, installed them a couple of years ago. Costs about £60 a month for electricity over the year, 3 bed terrace house.
Works well, warmer in the morning than you would want, but keeps its heat through to the evening. It has a boots function to warm the room up in the evening if you need it, but I never use it. It has a fan to get the last of the heat out, which is noisy, but not a problem.
One downstairs, one small one upstairs + an electric blanket and we are fine.