I know I'm not the only person confused by this!
I got a letter today saying my monthly DD would go up by £165.
I checked previous bill and it was the first one based on a reading for over a year and had but up arrears of … £175.
Of course all the increase was between the previous estimate and the actual reading so they extrapolate this to needing an extra £2,000 a year.
Easy enough to call them and change to as sensible figure, except they insist of explaining why the system, calculates such a high figure and it's not their fault…
After agreeing a sensible increase in DD, they offer me a better tariff.
Of course changing means I go through the whole process again, which insist on offering another hugely inflated DD amount, but they over-ride it but they can't be deterred from going through all the calculations even though basing this on one month that included two coldest weeks for years with extra heating flat out and multiplying by it by 52/4 is obviously going to go wrong…
Why on earth can't they base usage estimates on a full twelve months? In the UK it is obvious that usage is highly seasonal and that estimation errors should be shared out right back to the previous actual reading.
They then try and get me to commit to a smart meter while cheerfully pointing out they don't work with Economy 7 – I resisted by stating it's pointless having one until you can swap supplier without your smart meter becoming a dumb one.