This story seems to me to make little sense. The PAVE PAWS radar at Fylingdales uses high power in the 420-450MHz band. This has various secondary users including radio amateurs and an ISM allocation at 433MHz. As far as I'm aware smart meters use either 3G or 4G cellular networks, the frequencies for which are much higher than 430MHz. I can well imagine that with the ERP of the radar there might be some local problems with items such as car remotes which use the 433MHz ISM allocation but I can't see how smart meters could be affected unless their electronics are remarkably badly designed.
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I've just received a communication from my energy supplier to say that I can't access their better electricity export tariff as my home is "near RAF Fylingdales (it's 29 statute miles away) who operate their communications through the same network as the smart meter comms hubs used in the north. This means that the smart meters can interfere with their communications." Apparently, I will be able to access the better export tariff when "a new comms hub [that] has been developed recently" become operational; no timescale provided.<
This is hilariously silly nonsense. The PR imbecile who wrote it should be exposed to a few megawatts ERP at very close range and experience how the inverse square law for RF field strength works in practice.