I don't know much about the radiator thermostat except they seem incredibly expensive to me - was it £40 or £80 per radiator? - and I think they are pretty pointless - certainly sound like a sledgehammer to crack a nut in this case.
SWMBO feels the cold a lot and last year got an electric underblanket which is designed to be slept on. Here's a for instance, on Amazon tinyurl.com/2uchenhk - someone on the Q&A says it's 60w.
Or there are electric overblankets. Neither are that expensive to run.
And of course Black Friday is looming.
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