Final answer:
British managers of Nestlé likely acted as a Disturbance Handler in handling the backlash from the sexist Yorkie candy bar marketing campaign.
Step-by-step explanation:
In response to the controversy over Nestlé's 'Yorkie' candy bar slogan 'It's not for girls!', British managers likely found themselves in the role of a Disturbance Handler. This role involves addressing unexpected events and operational breakdowns. In this context, it pertains to dealing with the backlash from a marketing campaign that was perceived as sexist. They would have had to manage the situation to alleviate negative public perception and internal conflict that the advertisement may have caused. While the other roles listed such as Disseminator, Negotiator, and Spokesperson may have also been involved, the primary role in managing the disturbance and its implications would have been most paramount.