There is no up to date evidence that going "Smart" does save any money.
I belive that many of the saving originally in the business case have "failed to materialise" - to the extent that if updated, I doubt there would be a case.
Example: originally intended that they would form a distributed network of end-user voltage monitoring that the DNOs could use for network management. AIUI the SMETS standard didn't include an accurate enough measurement ability to provide that.
But as for end-user savings, changes in behaviour could be achieved with the cheap clip on kits you can buy for £30 ! And the industry even has a term called TTD - "time to drawer" for the display unit. Apparently a few weeks.
As to running washing machines and tumble driers overnight - good luck to those living in flats, apart from the drier fires.
Already the Nimbys are trying to block new pylons and excavations for cables.
Locally one of the engineering institutions arranged a presentation on a local grid upgrade (400kV link from west Scotland to Morecambe). Needless to say there's "some opposition" to the pylons and oeople asking why they weren't planning buried cables for the whole route.
In hindsight I wish I'd done it, but I was tempted to ask for a show of hands of those against the pylons, then "put your hands down if you've never looked for cheaper electricity or complained about the cost". And then pointed out the hypocrisy of those still with their hands up.
I had alresdy asked and the speaker indicated tbat roughly buried HV cables are 10x the cost of overhead, and tunnels (as planned under Morecambe Bay) around 10x the cost of buried. My expectation is that just about everyone demanding a more expensive project would also be complaining about their lecky bills.