Best answer by Darran_OVO
Welcome to our forum. Great question to kick off your forum journey!
We would usually advise customers to provide those the day before their statement is produced (you can check the date on your statement), this way the statement will be generated based on your actual usage. If you provide the readings on any other day, it will show as estimated as we don't have a full months readings from when the last statement was issued.
Does that make sense? I hope that helps. Let us know if you have any other questions.