Thanks for this thread TD.
It reminded me of the situation my daughter has found herself in. She thought her energy bills were very cheap in her flat for the last 3 years. Then on boxing day her electricity was cut off. Turned out her supplier had sent her correspondence addressed to the occupier (which therefore got binned) informing her that her DD was only for gas and not electricity (their mistake) , so they cut her off and then installed a PAYG meter, which took several days to find an outlet which sold the cards for it.
She had a serious chest infection throughout this period, so it made life miserable.
She offered to pay the £1500 immediately to have everything put back as it should be, but up to today she couldn't get them to do anything, including allow her to pay the bill.
I forwarded this thread to her, and she did a little research, made a couple of phone calls, and it turns out that they probably cant charge her a penny, as they have broken every rule in the book.
Superb.