Try opening the lockshield valve( the one on the other side to the main control valve but be sure to note the number of turns you give it as then you can lock it back to its original position if you need to. Also check the main valve is fully open.
If it's a simple rad with a straight forward twist on/off knob on each end then you want to let the in pipe fully open with the out pipe only slightly open (close the out pipe fully and then open less than one turn) . . the hottest pipe should be the in pipe.
I'm sure you know more about this subject than me Leo but just to say that my suggestion is based on my own simple 10 year old system . . I have all rads set as I have suggested and it works fine for me.Doing this, as mentioned above, will knock the system out of balance. So you may lose heat to other rads. See the link in this previous post on how to balance the system.
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