Assuming that you have a boiler and gas central heating and hot water.
I am almost too embarrassed to declare ours. I never normally monitor bills
, and confess I haven't really noticed before, but I just had to take the recent bill out of the filing cabinet and photocopy it for proof of ID, and noticed that it was (oh God, here goes) £160 for the month. Is this normal ?!?!
We are a bit lax with leaving lights on and tv on - will change my habits for my pocket and the planet, but we're not that lax