Without a smart meter, we saved more than 15% off our elec and 25% off gas bills. Smart meters will NOT save us any more. We had a local community energy metering project. More experienced helped novices. We read our meters weekly (we still do) and Local Council, Camden, lent us all meters which wrap around incoming elec , and send to display. Also a meter that measures how much say a frig uses and costs per week. (frig , while only 70 watts uses most because it is on 24/7, but a kettle at 2500 watts uses little because it is on only minutes a day).
I am waiting until the new generation of meters come:- "SMETS2" type, because they will work when you change supplier. "SMETS1" meters do not work if you change supplier, but they are still installing them.
The government are charging everybody about £1,000, added to elec bill to pay for smart meters, whether you use them or not.