Just installed new radiator in extension - does not heat up

The question has been asked, and he hasn't answered yet.

He's being polite, and has had the good grace to be public about his realisation of his probable c*ck-up, so I'm just saying that he's earned some patience in helping him to solve the problem that he appears to have created.

After all, he's added a rad to a primary circuit (somewhere), so he can't be a complete numb-skull.

Harry888888 - now would be a good time to post a picture of the connections that you've made...

Right valves and Left valves do make a difference don't they?

Yeah your right I am not sure where I have teed in I thought I was teeing in on the heating circuit flow & return like I have done before. Can anyone explian/advise the best place to tee into the flow and return.

If I was to start this work again could anyone explain the best place to connect the flow and return for the radiator.

This is driving me a bit crazy but yep it is all learning - my word I have learned.