Having tried the advice of rosebery, if the rad is still cold, there is air in the pipes leading up to this rad. To shift this keep the CH on and gradually turn off all the other rads except this one and one other. This should work just by turning off the adjustable valve on each rad. But if you close the lockshield valve as well, make a note of the number of turns you close. This will enable you to restore the balance of the system afterwards.
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