NAMED AFTER the coach house that De Grendel founder Sir David Graaff built in 1898 to shelter his horses, wagons and carriages, the Koetshuis Sauvignon Blanc used to be made from grapes harvested partly from a vineyard near the old coach house and partly from vines located in Darling. For the 2017 vintage, the grapes came from Darling and Lutzville, none from the