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A picture shows a financial graph on a television screen showing the movement of the foreign exchange rate of the British pound against the US dollar in realtime on the trading floor of ETX Capital in London on January 17, 2017 as British Prime Minister Theresa May delivers a speech on Brexit. Image Credit: AFP


LONDON: Sterling jumped on Tuesday by the most since June's Brexit referendum as Prime Minister Teresa May promised a parliamentary vote on Britain's deal to leave the European Union and stressed it would seek to stay a key European partner.

The pound, already up more than 1 percent as May began to deliver a keenly-awaited speech that had been extensively leaked to media, surged 2 percent on the day to reach $1.2278 at its peak.

Sterling jumps after Theresa May's Brexit speech. What's going on with the British Pound? Gulf News Business Editor Scott Shuey reports.

It also gained around 0.8 percent to 87.36 pence per euro, reflecting a broader sell-off in the dollar globally driven by concerns over Donald Trump's presidency.

The FTSE 100, which has tended to rise as sterling falls, extended an early drop led by exporters and mining companies as May spoke.

Gilt yields, which have been falling as expectations for future UK growth suffered from concerns over Brexit, rose around 2 basis points to 1.275 percent for 10-year paper.