See also Richard on a vertical of Iona Sauvignon Blanc and my recent notes on some of the Cape Winemakers Guild wines , as well as the Cape's other, recently highlighted, challenge . I have long thought that South Africa is the source of some of the best-value white wines in the world. South African winemakers seem in general rather more interested in their reds, about which there has been much discussion - not least the contentious ' burnt rubber' phenomenon . Although leafroll virus continues to plague red-wine production, each year brings better and better wines among the best (of both colours) that the Cape...