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In 2019, Britain - barring a sensational political U-turn - will be out of the European Union. But on what terms remains to be seen. How will post-Brexit Britain relate to the club it has just quit as well as the rest of the world? These are questions that Theresa May's Government has been struggling to answer, but they're just as difficult for the opposition Labour Party. HARDtalk's Stephen Sackur speaks to Labour's shadow foreign secretary Emily Thornberry - what would the opposition do about Brexit?