Coming from a Busines/Management background and without trying to sound too pessimistic, you will probabaly need a 1st to get into the highly competeive world of Management Consultantancy. As a career, it really does attract some high flyers from top Uni's. It possibly is worth doing a MBA [thats what we are talking?], but be aware of the cost [of course], and that potential employers still won't overlook an average 1st degree. Sorry if that sounds blunt.