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OK it has defeated me - got a plumber coming on Tuesday :) if anyone is interested I can update this thread with what the problem is, assuming the plumber is able to figure it out lol.

Can't see a label, sorry. Is it a sticker or something beveled or engraved on? If a sticker it is probably long gone.

Sorry just thinking about this more I have another column radiator that is identical to this one that works fine and the valves are the same way round. Edit: unless the flow and return pipes are themselves the other way round and the valves have been fitted incorrectly.

I just got back today and tapped the side - no joy. But I can't see any arrows on the back. Where abouts would I see them?

Am now away for a few days so will try this when I get back. Taps on the side of the valve? And to your other question - I don't know. Only just bought the house and the work was done by the previous owners.

All other radiators are off and yup, pressure topped up after bleeding.

Pressurised I think - combi boiler and no hot water tanks.

Yup running all morning with both pins fully open and still cold on one side. When I was bleeding it I stopped once a solid stream of water was coming out. Is it worth trying to bleed it again for 30 seconds or a minute or so to see if some trapped air is just struggling to get out? Can't see...

So the lockshield (or "lockshield" seeing as I don't seem to have a traditional one) is fully open already - would something like this be any use resolving the issue I'm having atm? Well, yes, otherwise this would be an easy problem to solve :)

Yup they are. Just removed the trv and it is identical on both sides.

Yup-the pin is definitely moving when pushed. Noticed that it sounded more like water was flowing when the pin was pushed down a bit so screwed the cap back on but doesn't seem to be making a difference to the heat.

Trv and lockshield with and without cap

The lockshield valve is a pin valve. There is nothing pushing it down, so my understanding is that it is fully open. The cap on the valve can be tightly screwed on so it may be designed to push the pin down when fully on, but I'm not convinced it has actually done that.

The radiator was removed recently in order for some plasterwork to take place and is no longer functioning properly. It's a vertical radiator and the two bars closest to the trv get hot, but the rest remain cold or at best get lukewarm after several hours of running the heating. The lockshield...