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In article ,
says...

Systems where the storage heaters are independently wired to an entirely
separate meter are quite different and I'm not even sure if there are
such systems around now.

I used to live in a flat built in 1991 and it had a radio signal
controlled meter with two outputs - One ou put was live all the time,
the other was only live during the E7 overnight period. These outputs
were taken to a split CU with the storage heaters and immersion heater
fed from the switched meter feed and the rest ofthe flat from the
unswitched feed.

Peter