The UK Supreme Court has ruled that the government does not have the right to trigger Article 50, formally beginning the Brexit process, without an act of parliament.
The court voted eight to three against the government, following an appeal from the High Court late last year.
In essence, the government argued that even though triggering Article 50 would lead to a change in domestic law and fundamentally alter the constitutional arrangements that EU membership had wrought, it should be allowed to trigger it without parliamentary consent. This was, it said, part of the prerogative power