According to British Market Research Association statistics, Nunwood grew by 44% in 2005, a figure hugely surpassing the industry average of 2.5%.
Phil Rushfirth, managing director at Nunwood, said the agency had been structuring its business around the needs of its clients including strengthening its online centralised information service, Fizz.
He said: "Market analytics and film production have really helped to build new and strengthen existing client partnerships."
Last month Somerfield agreed to trial a mystery shopper scheme conducted by the agency, aimed at identifying consumer trends.
In June Nunwood promoted Andrew Wiseman, its former head of global insight, to director of market analytics and hired Marco Guida as its statistical analyst.
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