Kitcatt Nohr's business performance was particularly strong during the year and it achieved a 70% increase in turnover from £5m to £8.5m.
It won new clients including John Lewis, The Salvation Army, WWF, Charles Tyrwhitt and Sling Media as well as projects for the RAC, Goldfish and Carphone Warehouse.
As well as winning the award in 2006, the agency was a runner-up in 2004 and among the best of the rest in 2005.