Those on standard tariffs who do not have a smart meter should submit meter readings on or around 1 October, says Uswitch

Millions of Britons could be at risk of overpaying their energy bill if they fail to submit a meter reading before next week’s price cap increase.

The more than 7 million households on standard tariffs have been advised to take action before their gas and electricity bills go up next Wednesday.

Those on standard tariffs who do not have a smart meter and do not submit meter readings on or about 1 October risk having some of their September usage charged at the new higher rates, the comparison site Uswitch warned.

The difference for just a week’s worth of energy at September rates compared with October is £17 for each home, it estimated. If 7 million households do nothing and are charged incorrectly, it would add up to a total overpayment of £125m.