Morning all! I'll reply to this thread and then start an October one if no one else has done.
I'm not sure whether they can 'legally' refuse to review my account, but when I phoned them last month and owed £148 they said that as they were still working on my 2012 figures (when I used a ridiculous amount of fuel) they couldn't reduce my payments anymore than they had (from £191 to £166) because the computer thought it would put me into debit. But in January they'd review my 2013 figures when I was a fuel saving bad ass, so my payments should reduce by a lot.
PS - am also on EDF's blue price promise June 2014 which is supposedly the cheapest tarif for me apart from a company called Spark who I have never heard of. EDF write to me when anyone releases a tarif which will save me more than £1 per week