Which is the genuinely oldest demarcated wine growing region in the world?  The port-makers claim it is the Douro Valley from 1752. But then Chianti argues it dates back to 1716 and Tokaj in Hungary insists its records begin at 1730. Then in comes Chateau Neuf du Pape that was apparently demarcated in the mid-14th Century by decree of the Avignon papacy.  

I need to know soon as my piece on port’s modern make-over goes out on the BBC’s From Our Own Correspondent at 11.30 Saturday December 19th.