James Gunn, founding director of Lexis's digital comms division Bluepool, won the Best Young Professional award.
Fees for the Bluepool division - which Gunn set up from scratch in 2000 - are on course to reach more than £500,000 this year.
Lexis also scooped awards in the e-PR, research and evaluation, and best practice categories, in addition to scooping an award for its Goodbye Golly work for Robertson's jam.
Countrywide Porter Novelli scooped Best International Campaign for its work for the European Council of Vinyl Manufacturers, which, according to judges, 'challenged perceptions of PVC'. The agency's tech arm, Porter Novelli Convergence Group, won Best Corporate Campaign for its work for Direct Line's mobile phones.
Elsewhere, Best Tech Campaign was Portfolio Communications' work on the British Museum's Mummy Project. GCI London's 'Always Wanted to Write a Novel?' campaign for WHSmith scooped the best media relations award.
Haslimann Taylor won Best Consumer Campaign for its 'Great Pea Debate' work for Harvester Restaurants.