UPDATE: A previous version of this article applied a survey from Ashcroft Polls from May/June 2018. This updated version uses a more recent Ashcroft Poll from September 2019. The result is a change of conclusion from “Inaccurate” to “Accurate”.
CLAIM: There is 51% support for a united Ireland.
CONCLUSION: ACCURATE. Although the Sinn Fein manifesto didn’t declare the exclusion of “don’t knows”, this revises a 45/46/9 split to a rounded 49/51 split between staying in the UK and leaving the UK and joining the Republic of Ireland.