When you switch your supplier, you shall be asked to enter your final reads. The new supplier will also ask you for your opening reads. Both will be validated by an independent meter validation company. They will check whether the read falls within their expected range.
They will then calculate the maximum allowable readings as below :
Maximum allowable reading = last validated reading + (expected usage * 2.5)
The expected usage mentioned above is calculated based on the Estimated Annual Consumption (EAC) of electricity or Annual Quantity (AQ) of gas for your meter. Every electricity meter has an EAC and every gas meter has an AQ of their own, stored in a central database. That value is converted to a daily rate.
The meter validation company will approve your reading if it falls in the expected range. If it does not fall in that range, estimated readings will be used.
Estimated reads are calculated by adding expected usage to the last validated meter read for your property.
So, if we did not use the reading you sent us, it is because it fell outside the range set by the meter validation company. If this is the case with you and you think it is a mistake and that we should use the meter reading you provided us with, get in touch with us here and we can dispute the meter reading for you. However, please be informed that if the reading and the estimate are quite close, the reading will be rejected in favour of the estimate.