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Should galleries take money from the likes of big oil? Ed Butler speaks to Jess Worth of the UK pressure group Culture Unstained, and Claire Fox, director of the UK's Academy of Ideas. And British novelist, art critic and broadcaster Sarah Dunant explains the well-established history of cash and corruption in the arts. Hong Kong billionaire philanthropist James Chen says donors need to engage with the issues.

(Photo: Protesters outside the National Portrait Gallery in London, Credit: Getty Images)