Accountancy firm KPMG has removed the leadership team of its South African arm. The move comes after an internal investigation into work it did for the Gupta family, as Verashni Pillay of Power 987 in Johannesburg explains. Also in the programme, pressure from the Beijing government has forced China's leading bitcoin exchanges to close. Simon Taylor is co-founder of 11FS consultancy and tells us why authorities in China are cracking down on crypto-currencies. A handheld DNA tester is helping farmers protect cassava crops. We find out more from Dr Laura Boykin of the University of Western Australia, and Dr Titus Alichai, from the National Agricultural Research Organisation in Kampala, Uganda. We have a report on the latest business trends at London Fashion Week. Plus we look back at the rest of the week's big business news with Anna Nicolaou of the Financial Times in New York, and Richard Cockett, Britain business editor of The Economist in London.

(Picture: A KPMG logo. Picture credit: PA.) Show less