I've been paying monthly on receipt of bill (after submitting reading) for 4 years now, but after yet another email from Scottish Power about how foolish this is, decided to go with DD. We're an all-electric property with storage heaters.
They've set it at £190 which seems reasonable for my predicted annual usage.
But of course, as I'm starting from my November reading I'm going to be in debt from December - my usage when the heating is on (will be on from 1st of the month until April) is about double the rest of the year.
Will Scottish Power:
A) Suck it up - after all, they'll get their money back in the summer months and it'll all balance out.
B) Freak out and make me increase my DD enormously
And since it'll obviously be B, why are they suggesting that customers who don't currently use DD start one at this time of year?
I'll be delighted to be proven wrong.