The Chocolate Society, 36 Elizabeth Street, SW1, 7259 9222. Definitely not the place to visit if you're on a January diet. The society treats chocolate with the gravitas usually reserved for fine claret. The ingredients are natural and each variety has its own character. It is the main importer of French Valrhona, the rich king of chocolate. It also stocks its own fresh truffles, chocolate flakes and 32 varieties of bonbons. Tasting is encouraged.