Yes. There are so many of them out there. It would be good for the companies to explain which is best rather than having to work it out from all the options. I suspect many people will switch tariff.
Yes - I pay by direct debit and I have just had a large bill, which doesn't make sense as I live alone. Instead of bills based on estimates there should be a way for companies to read your meter automatically.
CITY OF LONDON CORPORATION
No - There is supposed to be competition out there and different tariffs on offer. The bills can go up and down but in the end I think it evens out, so I just stick with the same supplier.