My mum had smart meters fitted a year ago so she wouldn't have to take monthly readings, which she was finding increasingly difficult - she couldn't have taken a photo, as someone suggested, because at least one of the two meters had a display that used to oscillate between different types of info, and she didn't have time to focus before it changed again.
She was happy with the smart meters, but soon put the in-house display in a drawer as it gave the (misleading) impression that she was using far more energy than she had previously.
I was keeping an eye on her account and - once I realized that the gas 'units' had changed from cubic feet to cubic meters - could see that her usage hadn't increased, though she hard to convince!
When I changed her supplier this June, those meters no longer worked, but her new supplier was happy to replace them, and the new ones are second generation, so should hopefully continue to work whenI have to change her supplier again.
I haven't asked her if the new in-house display is in a drawer yet, but suspect it might be.