How often should I send in meter readings?

My meter reads

We'll send your bill or statement every three months, and a few days before it's due we'll send you a reminder to give us your meter readings.

Don't worry if you can't send us your meter reading in time, we can still send your bill based on an estimate. To make sure your bill is as accurate as possible, it's a good idea to send in readings as often as once a month.