On the grounds that they took a reading late April which shows we are substantially underpaid . Is;nt the whole point of D.D that this should reverse out over the summer ? It is based on an actual reading which is correct . There is no point in fighting these big companies in my view so I will just have to bear it .

stanley37uk:

Maybe, maybe not. What should happen is that the DD correction should only happen once a year. Is that what has happenned?

Once a year is reasonable if the calculation is right, more than once a year may not be reasonable. What increase do you calculate as reasonable?

Regarding dealing with these big companies, the best way of having accurate DDs is to know your annual consumption and switch, specifying your annual consumption. If you do that now, while you will have to pay-off the underpaid amount, you will get an accurate DD going forward. Well you will with Scottish Power.