It was a rush job, as the old analogue meters depended on a signal piggybacking on BBC R4 LW’s broadcast to switch Economy 7 timings. This ran from the Droitwich transmitter that depended on a specific type of valve which ceased production in the 1980s. In the 2000-10s the BBC bought the last 12 unused valves in the world, but couldn’t make longevity guarantees. The smart meters had to be in place before the transmissions stopped. The transmitter shut down in June.
It was a rush job, as the old analogue meters depended on a signal piggybacking on BBC R4 LW’s broadcast to switch Economy 7 timings. This ran from the Droitwich transmitter that depended on a specific type of valve which ceased production in the 1980s. In the 2000-10s the BBC bought the last 12 unused valves in the world, but couldn’t make longevity guarantees. The smart meters had to be in place before the transmissions stopped. The transmitter shut down in June.