I have never experienced a more dysfunctional company. With my previous tenancy, I tried to start both gas and electricity supply with a different supplier than British Gas. A mistake from British Gas with the bills to the previous tenant caused more than a year of headaches. The transfer to a better and cheaper supplier never happened. I ended up with only one solution which was to pay British Gas tariffs for the whole tenancy. One additional frustration was the continuous stream of letters (more than a hundred, I kept them all, sometime more than one per day. None of them based on reality).