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I’m not sure if the TRV is bidirectional, I’ve taken a photo if that helps? Will check the lockshield - if I try and open that further will the rest of the system need balancing?

Our radiator in our living room is only luke warm at the bottom and boiling hot at the top. The pipe into the TRV valve is only slightly warm and the lockshield valve is boiling hot. We had the radiator refitted after some plastering around October last year. The radiator is the closest one to...