Parliament must vote on whether the UK can start the process of leaving the EU, the High Court has ruled.
This means the government cannot trigger Article 50 of the Lisbon Treaty - beginning formal exit negotiations with the EU - on its own.
Theresa May says the referendum - and existing ministerial powers - mean MPs do not need to vote, but campaigners called this unconstitutional.
The government is appealing, with a further hearing expected next month.
- Rolling reaction to Article 50 court ruling
- Kuenssberg: Will this mean early election?
- The High Court's judgement in full
- Brexit: All you need to know
A statement is to be made to MPs on Monday but the prime minister's official spokesman said the government had "no intention of letting" the judgement "derail Article 50 or the timetable we have set out. We are determined to continue with our plan".
Plebiscites only count when plebes vote the way they're told.
(Score: 2) by turgid on Friday November 04 2016, @11:56AM
This is the Intertubes. You're not supposed to talk sense. :-)
I refuse to engage in a battle of wits with an unarmed opponent [wikipedia.org].