Juhl takes over world's biggest ad buyer on 1 October.
Mindshare is expected to give up Fox account in Europe.
Staying wholly owned by WPP would have limited ambitions, Kantar CEO says.
Appointment ends long period of limbo for WPP's newest media agency.
It was "not sensible" to keep such a "tight" lid on incentives in final years of Sorrell era.
Ghost of former CEO still hung over this year's AGM, but the 'burden' is easing.
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