General Electric shares fell as much as 15% on Thursday after fraud investigator Harry Markopolos, who blew the whistle on Bernard Madoff’s Ponzi scheme, said GE was concealing deep financial problems.

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Supermarket group Asda has reported a fall in sales in the first six months of the year and warned about “uncertainty surrounding Brexit”.

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Shares in Aston Martin Lagonda tumbled to a new low as pressure continued to mount on the British luxury carmaker amid a broader market rout.