Hi Shortfuse, the above comments are spot on - below is the info from FAQ section regarding meter photos:
Why do you want a photo of my meter?We ask for photos of your first meter reading, so that we can resolve any disputes raised by your previous supplier as quickly as possible.
After the first reading, we will only ask you for meter photos if we receive a reading that looks out of line with what we'd expect.
For example, if your new reading was lower than a previous reading you had given.
Hope this helps .