LONDON (AFP) - Watch out Starbucks. British beermakers are wooing the caffeine-crazed with a new beer made from fair-trade coffee beans, to be launched on Friday. Coffee beans from the central African country of Rwanda are mixed with barley grown in Britain, creating a beer with the same amount of caffeine in one bottle as in a cup of coffee. Drinkers can get an added buzz from the political correctness of their coffee, labelled fair trade -- meaning it has been grown in conditions which ensure the fair treatment of and living wages for workers in developing countries. British supermarket...