By the side of the road from Sudbury in Derbyshire to Ashbourne, there is a lone eucalyptus tree. This is rolling country, small fields bordered by oak, ash and hawthorn. A eucalypt in this unlikely place stands out, its grey-green foliage so different from the more vivid greens of rural England, its pale trunk slimmer, its trailing swishes of narrow leaves more elegant, its thin branches more graceful than those of its stout and stubby British counterparts.