So I hang around until the 13th then, on precisely that date I submit our readings.
Just checked our account today and am dumbfounded to see OVO has added one extra day's estimated reading to those I submitted on the 13th, now telling me that the best day to......etc, is the 14th.
What's THAT all about?? It's a blimmin' joke isn't it. Tells me to do one thing, does something else. All I want is an accurate bill NOT an estimated one. Seems OVO are not technically equipped to carry out this simplest of tasks. Maybe just one of the reasons why they are no longer 'top of the class' in Customer's experiences (see "Which" Review). Or maybe simply building the case for earliest 100% installation of the dreaded SMART METER. I'm hanging out until the last second before I press go on that. I've heard some crazy things about them.
ANY COMMENT FROM OVO PLEASE?
Best answer by Tim_OVO
Updated on 15/09/20: To make sure you’ve actual readings on your monthly statements, the best time to send a reading is on the date we bill you each month.
Meter readings, usage and estimates
For non-smart-meter members on our new online account with daily charges that look like this:

When’s the best date to submit a reading for my monthly summary?
To make sure you’ve actual readings on your monthly statements, the best time to send a reading is on the date we bill you each month. You can see your latest bill online around 5 days after your billing date.
You can also check your up-to-date energy-use charges and account balance on the 'Home' screen by scrolling to 'Money in and out of your balance'.
Will an account balance update daily?
The standing charges will be deducted each day. Usage charges will only be deducted once a reading has been provided or when we estimate a reading for you billing date.
When we receive a reading how long does it take to update the balance?
Whenever a reading is submitted you will be charged up to date, this normally happens instantly.
Will we bill to estimates each month if we do not get a reading?
Yes, this is also the same for smart customers if the meter doesn’t communicate remotely.
Can a customer remove any incorrect readings if added in error?
Yes, just resubmit the reading for the same date, more info and a demonstration on how to do this in the video shown here
There’s another topic on this here