We only pay £40 a month DD for gas and were £30 in credit before winter but imagine we will be in debit in January, it was this thread which made me realise we weren't paying a lot lol. Last winter we paid £60 a month and were £100 in credit when we left, we don't have our heating on much because we're all out in the week, but it feels like it's been on more this winter and higher temp, so will grit my teeth till January, it doesn't matter with DD though they just let you increase the payments, our electricity bill was MASSIVE last year due to a ridiculous system in the building we lived in, we're still in debit £83 coz of it but paying it off slowly, they haven't minded at all, we always pay our DD on time.