Crown – Prerogative. The Supreme Court upheld the Divisional Court's decision that the Secretary of State For Exiting the European Union did not have power under the Crown's prerogative powers to give notice pursuant to art 50 of the Treaty on European Union for the United Kingdom to withdraw from the EU. The authority of primary legislation was required before that course could be taken. Consequently, the Secretary of State's appeal against the High Court's decision would be dismissed. The Supreme Court further ruled on certain devolution questions referred to it by the Attorney General for Northern Ireland and the Court of Appeal, Northern Ireland.