I can beat you all. We moved into a house that had just had gas installed but no-one had used it. We were told by previous owner he had arranged with British gas for us to be supplied and yes we had gas but when I rang them they didnt know anything about it . To cut a long story short for over 12month we were getting gas but no-one would charge us (believe me we tried 4 different companies and rang transco who said they didnt recognise our meter) Eventually we got a company to accept us as customers and sort out with transco but by then we had used about £400 of gas but as no supplier had been charged we didnt get billed and our present supplier gave us a bonus for signing with them!! Great while it lasted but we are now having to pay like everyone else