Best answer by Tim_OVO
Some of these boxes are big enough to fit the meter, as long as the engineer has a bracket on them to ensure they can tilt the meter upwards. However for prepayment customers, we don't fit them. The meter screen would be too close to the meter box wall even with the bracket, which isn't suitable for prepayment customers, as they need to use the meter's keypad to reconnect after going off supply.
If you want me to call the engineer and make sure this is the reason the meters couldn't be fitted, send us a message on Facebook or Twitter with your account number, full name and DoB. If you don't use social media send the team an email on email@example.com.
A quick last note: I've edited the title and moved the topic to the All about energy forum, to help other users with the same query find it.