The index of Britain's biggest listed companies has since recovered and is now flat, as of 11am. The FTSE 350, meanwhile, is up by 0.1%, as traders process news of a 0.1% decrease in GDP in September.

The S&P 500 rose 0.7% to 5,973.10, the Dow Jones Industrial Average remained flat, and the Nasdaq Composite surged 1.5% to 19,269.46. In the bond market, the yield on 10-year US Treasury notes ...