China is on the verge of becoming a wine superpower, and what is even more remarkable is that the man spearheading this vinicultural revolution isn't a Communist Party leader but an Oxford-educated Yorkshireman with a traditional Scottish castle at the heart of his vineyard.Nestled at the bottom of a craggy hillside, the grey granite castle commands stunning views across the countryside, a Saltire flapping lazily above its tall keep. Turreted towers look down on two courtyards of a castle that looks like it was built by a Scottish laird to ward off any foes foolish enough to consider an attack.