This is today's second instalment of our series of articles on Tuscany. See also the Vino Nobile di Montepulciano 2009–2006 tasting article and  see  Guide to Walter's Tuscan week  for links to all the other articles.   Parallel to the Vino Nobile di Montepulciano en primeur tasting runs a series of visits to estates, providing a welcome change from the tasting rooms. This year Tenuta Valdipiatta and Dei were among those who generously opened their cellars, the former coming up trumps with ten vintages of their most prized Riserva going back to 1983 and the latter showing six vintages of their...