evidence: Asked how they would vote in a referendum or "border poll" tomorrow, 49% said they would vote to stay in the UK, 41% said they would choose a united Ireland, and one in ten said they were undecided: a majority of 54% to 46% for the Union among those voting. While more than 19 out of 20 DUP and Sinn Féin voters backed the UK and unification respectively, SDLP backed a united Ireland by 56% to 12%, while nearly one in three saying they didn’t know. Four in ten Alliance voters were undecided, with the remainder backing Irish unification by 35% to 25%. Support for a united Ireland declined sharply with age: 71% of those aged 18 to 24 said they would choose unification with the Republic. [...] More than 6 in 10 (63%) said they thought Northern Ireland would vote to stay in the UK in a referendum tomorrow – but by 51% to 34%, they thought a border poll in ten years’ time would produce a majority for a united Ireland.