On Fri, 21 Sep 2018 15:01:45 +0100, bert wrote:

They'll be basing their projected cost on you not doing anything
when
your current fixed term ends in November. For the 10 months after
November they will be using their standard variable tarrif. They
are
simply following the rules regarding the assumption you'll "do
nothing" and also the rules that say they mustn't let people run
up
big debts.

Rules that do nothing to make things clear.

That is the explanation I have arrived at too. A change of
supplier is
due. E.On seem to be my cheapest option from MoneySavingExpert,
with a
one year fix, even cheaper than what I am paying at the moment.

Given the above explanation are you sure? MSE are governed by the same
rules and will claim savings based on those rules as explained above.
I use comparison sites purely as a ranking system.

Which works as all the calculation is done using the same set of
rules, so the cheapest listed probably will be the cheapest. The
calculated annual bill for a given tarrif will be right provided you
have given the site an accurate comsumption figure. Any quoted
savings are likely to be way off the
mark.

For actual costs compared to what I pay now I use a spreadsheet.

The only way to do it with any measure of accuracy.

--
Cheers
Dave.