Aviva, the insurance company, is reviewing its international creative advertising account -- potentially bringing an end to its decade-long relationship with Abbott Mead Vickers BBDO. Aviva’s decision to review its advertising account comes months after its chief marketing officer -- and AMV BBDO’s main point of contact -- Amanda Mackenzie, took a two-year secondment from the company to run a charity project. Chris Wei, the chief executive of Aviva’s global insurance business, is running the pitch.