The selection of a vine variety, a clone or a rootstock, whether for planting in the UK or any other part of the world, can only be taken with reference to three principal factors: the climate, which dictates the spectrum of varieties which can be grown; the quality of the site on which the vines are growing; and the type of wine to be produced. In cool climates, such as the UK's, which many would consider marginal for sustainable viticulture,...