now don't panic james it isn't going to cost more than £2 -£3 probably less. it would be a good idea to reset the timer though, so it only comes on the hours you want it to. and it won't be long before the warm weather is with us and you can switch the heating to the off position.
I accidentally left the heating on pretty high, I'm worries about a large bill and I've only been in the house a day!
