There's been some very informed points made on this thread. There's also been some utter nonsense.
I understand why some people have specific reasons for not wanting a smart meter (as explained on this thread). eg, they have poor mobile signal, they rent, they can't be bothered waiting in, they want to wait for a better, next generation one.
Makes sense - no-one is going to force you to have one and for a small minority of people they will not be suitable anyway.
However, I do find the "I will NEVER get one" brigade a bit harder to understand.
It reminds me of people I know who swore that they would never, ever use a mobile phone/broadband/internet shopping/chip and pin/self service tills... etc etc they couldn't see the point of the technology and they were deeply suspicious of it. Almost everyone uses all those things now without thinking about it.
And
that getting a pre-payment meter fitted is more convenient than a smart meter! A pre-payment meter is a terrible idea unless you are forced to have one. They exacerbate fuel poverty as the rates are generally less competitive and it is harder to switch (although this is getting better) whilst the people most likely to have one are (often) poorer. www.moneysupermarket.com/gas-and-electricity/prepayment-meters/
Worse case scenario with a smart meter is that if it can't cope with you switching it becomes a dumb meter.
"So they can selectively cut you off, if the supplier has a shortage in the future. That's what I was told."
Demand side response is a thing, but it is not really to do with domestic consumers; the idea is that if there are serious shortages in supply during times of peak demand (a serious future risk), participating businesses can reduce their usage. There is a financial incentive for them to do so, and they are not forced to participate. www.nationalgrid.com/uk/electricity/balancing-services/demand-side-response-dsr
Tbh, if we found ourselves in the scenario where the supply during peak demand was so insufficient that they were forcibly cutting off domestic consumers, we'd all be in the shit anyway. In that hypothetical scenario it would be a choice between reducing supply in a controlled, time-limited way (eg it would take longer to boil your kettle) or rolling blackouts.
If energy security in the future takes a hit, refusing en-masse to get smart meters is not going to protect us from blackouts and brown outs. Quite the opposite!