£8.49, Waitrose Terret Blanc is an ancient grape variety that has languished, unloved, in Languedoc for decades. It gets lobbed into blends now and then, but rarely gets its own show. Winemakers Laurent Calmel and Jerome Joseph, the dynamic duo behind both the Villa Blanche and Calmel & Joseph labels, are changing that with a minerally, zesty, dry white that has elements to appeal to Chablis drinkers on one side and Sauvignon Blanc drinkers on the other. There’ll be defectors