GUINNESS BLACK LAGER IN US 'NOT THE SCALE OF SUCCESS WE WOULD HAVE LIKED' Diageo: Talkin’ 'bout the next generation…of Guinness drinkers 28-Nov-2013 By Ben BOUCKLEY Diageo’s beer innovation head insists the firm needs to strengthen Guinness’s premium credentials and 'reframe' the drink for a new generation of drinkers to reignite growth.