In the 1980s, supermarkets stocked a fruit juice named ‘Um Bongo’ with the strapline ‘They drink it in the Congo!’. This is the starting point for Adam Brace’s examination of Britain’s relationship with the Congolese (whose word ‘mbongo’ means money).

A group of do-gooding Londoners host a festival to celebrate the Congo’s culture and history but they rapidly become mired in controversies about age-old injustices and white-to-black ratios on steering committees.