Transfer a tenancy to someone else so you break the contract and then the new tenant chooses a new gas supplier because they are a deemed rate (out of contract customer) go for the big companies such as British gas or e.on. Speak to the sales advisers they all know what BES Gas are like absolutely . They will make life difficult to transfer from them but keep persistent and not panick when the make threatening calls or letters to stop transfer. They will also tell lies say that they still your gas supplier when they no longer are just to get more money out of you. There staff are incompetant so and sos can't tell if meter is metric or imperial or do any simple calculations, as they never give you accurate bills from meter reads. They make monthly gas charges out if their backsides. Get help from the new big company staff hey are well trained and know what they taking about. I'm surprised ofgem don't take BES Gas licence of them!