Britain top share index endures worst day of 2019.

• Position: Financial Times Stock Exchange

UK shares plunged to their lowest in a over a month on Friday after US President Donald Trump threatened to hit China with more trade tariffs, while a Brexit-induced warning on targets knocked shares in Royal Bank of Scotland.

The FTSE 100 index slumped 2.3 percent on its worst day so far this year, while the FTSE 250 midcap index weakened by 1.7 percent. All of the major constituent sectors on both indexes ended with losses for the day. The last...