Are Western brands doing enough to keep forced labour out of their supply chains? Ed Butler speaks to researcher Darren Byler at the University of Colorado, who says tracing products from slave labour institutions in China's Xinjiang province to the west is not easy. Alan McClay from the Better Cotton Initiative explains what they do to monitor slave labour. Kate Larsen, a private consultant specialising in supply chain problems, says Western firms are only slowly understanding the scale of the problems they face, and what they have to do to tackle them.

(Photo: The Chinese flag behind razor wire at a housing compound in China's western Xinjiang region, Credit: Getty Images)