I have, annoyingly, noticed a small rust spot that is still underneath the paint at the moment on the tailgate on my 57 plate 197, just below the rear wiper on the little return where the glass joins. About half the size of your thumb nail. Now I'm 99.9% sure that it hasn't ever had paint, being only the second owner and knowing the first. Has anyone had experience of claiming on the bodywork warranty for this or am I wasting my time??