LONDON—British Prime Minister Theresa May abruptly postponed a parliamentary vote on her Brexit deal on Dec. 10, throwing Britain’s plan to leave the European Union into chaos after admitting that she faced a rout.
May’s move on the eve of the scheduled parliamentary vote opens up an array of possible outcomes ranging from a disorderly Brexit without a deal, a last-minute deal clinched just weeks before Britain’s March 29 exit, or another EU referendum.
