Coming from the broadcaster known for making factual entertaining, it's no wonder that Andrew Mackenzie's kingdom as head of factual entertainment at Channel 4 is such a broad one, commissioning programs as wide ranging as the Bafta-nominated single doc Thriller in Manila to Supernanny. Carol Nahra spoke with Mackenzie about how the department is evolving and what will take up the copious airtime left by Big Brother after its final run next summer.

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