In parliament, it has sparked fears about how far the British establishment has been infiltrated by spies. In Beijing, there has been outrage. For Prince Andrew, it has led to him missing Christmas dinner at Sandringham with the rest of the royal family. It is fair to say the accusation that the Chinese businessman Yang Tengbo has been spying for China has caused a serious stir.

While Dan Sabbagh tells Michael Safi what we know about the extent of Chinese spying in the UK and how it works, David Pegg examines how the scandal unfolded and caused Tengbo’s meetings with everyone from Prince Andrew to Theresa May to be put under scrutiny – and why, for the man at the centre of the story, it is all an unfair smear on someone who loves the UK and only wants to build better business relations between the UK and China.

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