The move follows a restructure of the group's development department into an internal agency, called Guardian Creative. The arm will handle all direct marketing, sales promotion and ambient briefs for The Guardian and The Observer.
CHJM has worked on the account for just over three years. Its contract will be terminated at the end of the year.
Guardian Creative will also take on the development department's responsibilities for editing, designing and publishing commercially driven magazines and supplements for The Guardian and The Observer.
Guardian Newspapers' ad agency, DDB London, and media agency, PHD, are not affected by the changes.
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