OMD and Kitcatt Nohr Alexander Shaw took the media and direct prizes respectively, while AKQA won the digital category.
RKCR/Y&R won the Grand Prix at this year's IPA Effectiveness Awards for its work for Marks & Spencer. The ads it has produced have been central to the recovery of the retailer, whose UK sales rose 10.5% in the six months to September. The company cited the 'Your M&S' campaign as a major factor in its revival.
Elsewhere, the agency took the bold move of putting Kate Moss at the heart of Virgin Mobile's ad campaign at a time when other brands were dropping her. It also won a place on the BBC's £20m advertising roster.
OMD, which picked up £78m of new business in 2006, triumphed due to its efforts to innovate. The agency oversaw Vodafone's secret gigs activity and created a blog to back its award-winning Sony Bravia ads.
Kitcatt Nohr's highlights included winning Citroen's direct account and a series of briefs from Norwich Union, while AKQA won global assignments from McDonald's and Smirnoff.