evidence: Indeed, nearly two-thirds of unionists believe there should never be a referendum on Northern Ireland’s constitutional future. Support for Irish unity is most prevalent in younger age groups. Among 18-24 year-olds, 48% want a united Ireland with 43% choosing the Union. [...] Some 69% of SDLP voters would vote to end the Union with 14% voting to keep it, 11% unsure what they would do and 6% who either wouldn’t vote or would spoil their vote. Non-voters are much more likely to be unionists: 53% say they would vote to keep Northern Ireland in the UK, 30% would chose Irish unity with 17% undecided.