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This may soud like a dumb question but when you say nut do you mean the silver bit, or the black bit directly above? And is there any danger of causing a breakage or leakage?

I thought the roblem with my radiator was rapped air, but after bleeding it I've foud it's still completely cold. However after some googling I'm now thinking it is the TRV perhaps? The image below is a bit blurry, but is tha little nob in the centre what's causing the problem? Has it got stuck...

Ah so it's the one on the top. Yes I'm planning to go and buy a key tomorrow - may have to remove the top of the radiator in order to get it to fit the valve I'm thinking. Thanks for your help

Can anyone tell me, from looking at the attached pics - is my bleeding valve the thing at the top of my radiator (2nd pic) or the square shaped hole at the upper right hand side? (3rd pic)