Sure, but we've "moved on" from that to equivalent but 'more convenient' solutions.
In my present home, I've always had a dual tariff. It started with an 'external' electromechanical time switch and two meters. It then moved to a single dual tariff meter, still controlled by the external time switch. 'Finally' (i.e. 'still now') it changed to a single electronic dual-tariff (still 'dumb') meter with some sort of internal clock, hence no need for an external time switch.
The next, and, I suppose, 'really final' stage will be the ultimate change to a 'smart' meter - but, as I've said, there certainly is no 'need' (other than a bureaucratic/policy one) to have a 'smart' meter in order to have a dual tariff.
Yes I have an export meter which has never been used. The system was simple, the supplier can't force anyone to have a smart meter, but if you refuse, they can also refuse to allow dual tariffs or export payment. So to refuse is to cut off your nose to spite your face.
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