Think I must have given an incorrect electric reading in January as I have just read the meter and it is lower than last time

This is a customer forum so best you contact Bulb direct, use the help button for contact details.

If you’re sure it’s a mistake and not a problem with the meter itself, your account will correct itself with the next reading you supply. You’ll then see a higher charge for the most recent period (if you wait roughly the same length of time to submit readings) but overall it’ll be right.