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The commissioning execs behind BBC4 international documentary strand Storyville and the BBC's TV music output are both leaving the broadcaster.

Six months after the largely acquisition-focused Storyville was folded into BBC Film and four years since taking up the role, Mandy Chang is moving to Fremantle as global head of documentaries.

Heading up the company’s new global factual department, she will oversee production of high-end docs.

Her departure follows that of assistant Storyville commissioner Hayley Reynolds, who joined Sky’s factual team in February.

Chang has overseen 80 films for the BBC strand, including this year’s Oscar nominee Collective [main picture], Undercover OAP: The Mole Agent and The Hunt for Gadaffi’s Billions. She leaves in August.

Last week, BBC head of music commissioning Jan Younghusband announced her exit from the broadcaster after 12 years for as-yet undisclosed “new creative challenge”.

Her duties will now be split between pop music controller Lorna Clarke and director of factual, arts and classical music Patrick Holland.