Question Author
balanced the system, very little difference, as said before all the otehr rads were getting hot on all floors, just the one...soved it though! It turned out to be the thermostatic valve controll? i noticed when it was put on it, you had to push, thus making the valve plunger go down, so i left it off, and within 15mins the rad was piping hot?? So i can assume this controller, when on the valve must be automatically pushing the valve down and setting the rad at may be 3 or 4, so stands to reason it will never reach full temp as the valve will shut it off when it gets warm as opposed to hot? Not sure how i am going to solve the problem long tem, but as it is cold will leave it on constant, can always turn off the little one if it gets too hot!!
thanks everyone for your help.