Best answer by Strutt G
Good morning and welcome to the community.
PP send us this as a reminder 3 days in advance of our dated statement re joining anniversary.
If they sent this prompt any earlier then our usage would have to be estimated by more days instead of just 3 days, which is just a few pence. If PP left it any later leading up to the statement then I guess more people may miss or forget.
Some members submit there reads on the statement date which is emailed the day after so their energy is not estimated. I'm not that bothered either way because when my energy is estimated (the few pence) its about almost as close as if had sent my readings at the optimum time.
It all pans out, you only get charged for the energy you use and our DD's remain unaffected.
I look at this method as plus.
Have a great day