Artes Mundi: The 40-minute video that won £40,000

A video art installation inspired by migration and religious persecution has won a £40,000 prize.

London-based film-maker John Akomfrah won the Artes Mundi award for his "substantial body of outstanding work", including his latest video installation - the 40-minute film, Auto Da Fe.

Will Gompertz went to meet him.