The arrival of group of Japanese winemakers in London last month was the culmination of three years work aimed at convincing them, and latterly us , that there just might be a future for Japanese wine beyond their island nation. Sake , beer and even schochu we expect, but wine? Most of what has until now passed for wine in Japan has either been imported or grape concentrate fermented in Japan, the latter bearing no more resemblance to the real article than Armani made in Taiwan. Most, but not all.