Huntsworth, the U.K.-based PR and healthcare consultancy whose firms include Grayling, Huntsworth Health, Red, and Citigate, has added Atomic PR to its list of agencies. The move expands Huntsworth’s North American presence.

The acquisition, for $13.3 million in cash according to Reuters, accompanied the business’ preliminary results for the year ending December 31, 2010. Hunstworth reported an 11.1 percent increase in revenue to £173.6 million (about $286.14 million, based on today’s conversion rates) and pre-tax profit of £26.7 million (about $43.4 million).

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