WPP has released its 2010 preliminary results, reporting that billings increased 12.6 percent to $65.961 billion. Based on constant currency, revenue was up 5.6 percent, reflecting the weakness of the pound versus many other currencies. But reportable revenue was up 7.4 percent to £9.331 billion, or $15.158 billion, based on today’s exchange rates.

PR and public affairs was nine percent of revenue as a total percentage of the group, up 4.3 percent from 2009. Branding and identity and healthcare and specialist communications were 24.9 percent of revenue as a total percentage of the group, up five percent from the prior year. Hill & Knowlton, Cohn & Wolfe, Ogilvy PR, and Burson-Marsteller are among WPP’s firms.

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