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The lockshield is definitely on. Only the pipe attached to the lockshield is warm. Like I said, it got warmer when water was bursting out of the TRV end (I accidentally took the pin out, although replaced it successfully, and checked it functioned properly).

I removed the TRV, and checked the pin, and it's spring operation is working fine. I removed the pin erronously, and the radiator began to warm up, but once I replaced the pin it cooled down again. Only one radiator doesn't work in the whole house (in my room!) and I can't work out what the...