The agency won for its "test the nation" activity on Unilever's Flora Pro.Activ brand.
Other winners included Manning Gottlieb OMD, which won in the Best Total Communications Category for its Home Office campaign for Police Community Support Officers. OMD UK won two awards, for Tetley's Bitter and Rimmel, while Media-Com landed two awards for its Metropolitan Police Trident activity and for Egg.
The winning sales teams were Emap Advertising for Best Radio Sales Team, Viacom Brand Solutions for Best TV, Guardian News and Media for Best Digital, Telegraph Media Solutions for Best Print and JCDecaux in the Outdoor category.
Mark Zuckerberg, the Facebook founder, was named Media Achiever of the Year.