Zappi
> I think you might be talking about a "Zappi" type solution
Sort of. What I am saying is, every modern smart meter and EVSE has the capability to implement this type of "solution", and it looks to me like the intention of the powers that be is to move more people onto this (with or without their consent) instead of upgrading the electricity supply infrastructure.
> purely for diversity reasons, nothing to do with grid stability or peak time usage
That's where you are missing the point. I am worried about "distribution" here; i.e. your local 11kV substation and the cable under your road, not national generation/transmission. Mass adoption of EVs and Heat Pumps means that the old "diversity" argument breaks down, because the peak has widened significantly if it takes hours to home-charge an EV and hours to heat the water tank / bedrooms. There's no way that anyone's local substation and existing cabling could cope with everyone having heat pumps and EVs, because that would mean something like 50A per house, for several hours per day. The cables are rated to no more than 400A and serve 20-40 houses, but you only need 10 EVs on charge (and nothing else) for them to be overloaded. It would cost hundreds of billions (at a wild guess) that the UK and the DNOs don't have to upgrade this for the whole country.
Basically, I do not trust our privatised DNOs as far as I could throw them, and I fully expect them to cheat on their obligations to deliver a fit-for-purpose supply that will cope with the phasing out of Gas. They will keep the old infrastructure going as long as possible (and replace it only like for like when it fails) instead of upgrading it, they will try to "adjust consumer habits" via smart meters, and if that fails, turn consumers off via smart meters.