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Trading in weapons can be a controversial business, which might help explain the secrecy that surrounds it. Artist Jill Gibbon went undercover with a sketchbook to arms fairs and company AGMs to record a flavour of the trade. She told Newshour's Rebecca Kesby about her project, War Mart.

(Photo: One of Jill Gibbon's drawings, showing a delegate eating sweets in front of a fighter jet. Credit: Jill Gibbon)