Heres my experience, I was getting monthly estimated bills for my electricity, I couldn't ever get in touch to give a meter reading nor was I ever prompted too but it didn't bother me too much until I started getting silly money taken from my bank every month due to British Gas's 'estimations'. I decided to leave and go with another energy provider, British Gas got my final meter reading and for have sent me a bill of £540 for the period of 17th May - 17th June. £540 for a month! I live in a 3 bed terraced house not Michael Jackson's Neverland mansion! I contacted BG to be told they have got it wrong and they will send me the correct bill around 14 days later, 6 days later I get another bill for the exact same amount only this time telling me I have until 20th July to pay it. I contacted BG and was told the bill is correct and they had 'undercharged me' the month before (they have been charging me £45 a month, my new provider took my meter readings which showed that I use around £30 worth of electricity a month, oh, also im currently using £17 gas a month and BG was charging me £40 in the height of summer). I made a complaint to BG and asked for the outstanding balance to be put on hold until a complaints handler contacts me, I woke up this morning to find my credit score, which I have worked hard to maintain, has dropped below fair (it was a really good score and I have never missed a payment with BG) because there is now an unpaid mark from British Gas against my score now. Even though the payment was not even due for anther 5 days. Thanks British Gas im trying to get a mortgage which is hard enough already, bt thank you for dropping my credit score and having me crying for the past week! Guys please don't join British Gas, this is what they do to you when you try to leave!!