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Leveson, Hutton, Scott and Chilcot public inquiries

21 November 2011 Last updated at 14:16 GMT

The Leveson, Hutton, Scott and Chilcot inquires made the headlines but what good do they do and are they worth the money they cost?

Giles Dilnot looks at why inquires are held as he spoke to Public Inquiry Counsel Ashley Underwood QC.

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