Hadlow is taking a sabbatical in order to focus on writing a book on George III. She will also spend some time consulting on the wider BBC Vision strategy.
Jana Bennett, director of BBC Vision, said: "Having commissioned both current affairs and arts programmes for BBC Four since its inception, George really understands the channel and I know he will steer it effectively and creatively through the next six months.
BBC Four was named Channel Of The Year at Edinburgh in 2006.
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