As interest rises regarding the collection and investment of rare whiskey bottles, and signs of an unsustainable ‘bubble’ develop around some of the most popular releases, a whisky broker has launched what’s claimed to be the first-ever comprehensive guide to help inform up-and-coming investors. The Whiskey Bottle Investment Guide, an 80-page guidebook full of tips and tricks, has been created by prominent UK whiskey broker Mark Littler to “cut through the hyperbole and bust some...