LONDON—Sterling tumbled to its weakest since April 2017 on Dec. 10 after Prime Minister Theresa May pulled a parliamentary vote on her Brexit deal with the European Union, panicking investors about deepening political uncertainty in Britain.
May said on Dec. 10 she was delaying the planned vote as her deal would likely be rejected “by a significant margin”. Colleagues had told May that she faced a rout in the vote, that was set for Dec. 11.
