Thanks nigelh for figuring that out! It could hardy be more complicated, although I'm sure CAA could work on that!
Its high time that licenses became more internationally recognised to avoid ridiculous complications like this. The crazy thing is that you fly around Europe in an N-reg without any complications but jump into the same aircraft with a G-reg and there are a heap of restrictions.
Maybe in our lifetime we will see licenses being more universal..... Or not!