No real statistics
I went looking for actual figures on how much energy they are saving, which they would know for sure by now. To me it seems very simple. You look at the energy used by a household in the year before having a smart meter compared to the year after having a smart meter. No one is collecting those figures and I strongly suspect it is because they don't want to know the real numbers. What they are doing is comparing average smart meter households with average non-smart meter households. Much easier to fudge those figures. What is an average household? One bunch of statistics I did find was:
"Supplier A shows electricity consumption reductions of 3.70%. Supplier B, Supplier C, and Supplier D show 1.12%" From this they concluded "The pooled estimates are -3.43% for electricity". Creative mathematics.
https://assets.publishing.service.gov.uk/media/64831d59103ca60013039c7a/energy-supplier-review-of-smart-meter-energy-consumption-impacts.pdf
They are trying so hard to find a saving of 3% from having a smart meter but it just doesn't exist. 3% would be pathetic anyway, given what has been spent. There are no savings because people already know that electricity costs money and have already made their lifestyle choices. A smart display, languishing in the drawer of oven manuals and washing machine restraining bolts, is doing nothing.
Other commenters have mentioned the real reason for smart meters is remote disconnection. Don't forget remotely switching the meter to pre-pay without a court order (or even notifying you first, in some shocking cases).
Smart meters could have been a benefit to consumers. Octopus run events where you can get paid to reduce your energy consumption at certain times, which is only possible with smart meters. Instead they created machines with features that no sane person would want. They've lied constantly about the benefits and allowed Crapita to steal from us all. Pretty normal for a UK gov project.