In A Reference by the Attorney General for Northern Ireland of a devolution issue under paragraph 34 of Schedule 10 to the Northern Ireland Act 1998 [2026] UKSC 16, a seven member Panel of the Supreme Court has unanimously overruled the 2014 majority decision in Cheshire West. The judgment is long and detailed. A summary by the Supreme Court can be found here, and a more detailed summary prepared by members of 39 Essex Chambers is here.
There is no ‘grace period’ for implementation of the judgment and so the approach in Cheshire West must not be followed with immediate effect. The many guidance documents which refer to it need to be read in that light.
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