Airhead-
I might give that a go if the key is a bust, cheers. I had thought about a socket, but then the 4 sides v 6 sides problem stopped me from trying. But if the key doesn't work, then a little brute force is not going to make things worse. Trying to remember now what my smallest socket is. Got as far as considering filing the outsides of my smallest spanner, but it was too big. Also just remembered I have a drawer of random vintage spanners I nabbed at a car boot sale about 20 years ago that could also be mangled with no love lost.
Seriously, if someone trustworthy said "For £200, I will make a new, not fancy, radiator appear on this wall, plumbed in" I would bite their fucking hand off. But I'm totally fed up trying to find new trades. I'm sure there's any number of handyperson on FB or Checkatrade, but I'm so tired of looking, reading reviews, worrying that they'll fuck something up, letting yet another stranger in my house etc etc
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stevo_com
That's what I originally thought but it's recessed inside a small hole so can't think what to use to cut the slot. Even a dremel cut off disc would also cut the rad around the outside of the recess. Given how stuck it is, it would need to be a decent slot. Will see how I get on with the new key in case it's just a combination of slightly rounded nut and slightly rounded key.