[ricnor]

Thanks for the reply at least I know it is cureable, however in this case not as easy as your one. The first thing I did was try to tighten it up but it didn't seal the leak so now I am going to see if I can get a rubber seal and insert it into the header and re-tighten the nut. Fingers crossed as it will cost a small fortune over here for someone to split the tanks from the core and re-seal and on top of that the radiator is in great condition apart from this issue.