I don't usually drink soda, but when I was in London last summer, a lot of the museum cafes sold this wonderful green-apple flavored soda in squat little glass bottles. Can't remember what the name was, but it tasted great, really tart and apple-y and not too sweet. There are a couple specialty beverage companies here that make that flavor, Jones has one I think, but they're all sickeningly sweet. I tried some type of herbal soda there too which, while I didn't particularly care for its flavor, was also pleasantly not-too-sweet.