Thank you for you reply Simon. It is wierd. It is dripping not from the radiator but a metal bar behind it and the liquid is yellow. The coolant reservoir was just replaced so is new and there is no powder around the cap.
What is weird is a small amount of liquid running down from the right hand side, to the right of the bolt, of the black box (sorry 😣
that has the V6 badge on it. I don't think it can be coming from above.
I wish I could attach pictures, it would make more sense to you!