Chinese companies operating in Britain, especially in the financial sector or whose European headquarters are in Britain, need to take "precautions" due to uncertainly over Brexit, China's ambassador to London said.

Before Britain's vote to exit the European Union in June last year, China had not directly stated an opinion, viewing it as an internal matter and saying only that it wanted to see a strong and stable Europe.

Diplomatic sources, however, said that was coded support for the defeated "remain" camp, as the bloc — China's largest trading partner — will lose around a sixth of its economic output and an important supporter of free trade in the EU.