Hi all. I have just fitted two new rads, tee'd onto what I assume is the primary flow and return from the boiler (28mm reduced down to 15mm to the rads) (the only connections accessible). All piping and connections seem to be good and the rads filled correctly and bled. The boiler flow pipe is getting hot and all other rads are too. No heat though is passing down the new loop to the new rads. I have tried closing all other rads but it made no difference. I have no doubt done something daft but any suggestions would be appreciated. And I had thought I had done such a good job!! Thanks.