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Can you open the lock shield valve any further? Could be restricting flow on that radiator. Failing that, close both valves, drain the radiator, take it off the wall, flush it outside with a hose to remove the crap inside and refit. If that doesn't work, then get a plumber/heating engineer to take a look.
stevo_com
Is a central heating Powerflush money well spent? We have one rad that was noticeably cold over winter (despite bleeding) - is it a better idea to get that individual rad cleaned out somehow?