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In page Case of Proclamations:

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The Divisional Court unanimously rejected the government's argument in robust terms (which were subsequently upheld by a majority of the Supreme Court). The court concluded that the government did not have the right to rely on royal prerogative to serve a notice pursuant to Article 50 of the Treaty on European Union, triggering the formal process for the UK to leave the EU. The court added that, because Brexit would directly affect substantive legal rights under UK domestic law, only Parliament could decide whether to serve such a notice.[2][3]