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We're having the same problem in our new (old) place. We've noticed the directional valve is on backwards. We think the balancing is all wrong and also I'm sure the rad is old and full of crud.
All our rads are imperial or I'd have spent a day swapping everything over to modern type 11/21 depending on room. Extension tails are making it less appealing to me.
Grumpy_Git
Speaking of which, thermostatic valves - we have one that doesn't seem to work. At the moment we are removing it completely to get heat and putting it back to shut off the radiator. The pin in the radiator goes up and down ok. The pad inside the valve goes up and down with some effort but it seems like the radiator pin can't push it enough. New valve time or can they be lubricated with a squirt of WD40 or similar?