The extra yield that investors get for holding U.S. 10-year notes instead of similar-maturity U.K. gilts jumped to the most since March 2015 as signs of an improving economy bolster wagers that the Federal Reserve will raise interest rates this year. That’s in contrast to the U.K., where an uneven recovery and the prospect of increased market volatility before and after a vote on the nation’s membership of the European Union in June has increased speculation the Bank of England will keep borrowing costs at a record low for longer.

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