Brexit legal challenge: Theresa May needs parliamentary approval to trigger Article 50, High Court rules – as it happened

Historic case hands Parliament opportunity to challenge, or even delay, the process of leaving the European Union

Gina Miller gives statement after High Court rules triggering article 50 must go through parliament

The High Court has ruled on whether Theresa May cannot bypass Parliament when she triggers Britain’s exit from the European Union.

Here are the latest updates:

• The Government has admitted that an Act of Parliament is likely to be needed to trigger Article 50, delaying Brexit
• Fate of Article 50 now rests with the Supreme Court
• Majority now want to remain in EU, poll finds
• ​Is this the end of Brexit?
• Bookies slash odds on Brexit not happening
• Theresa May must get approval to trigger Article 50
• What does the ruling mean?
• How the decision affected the pound
• European media brand ruling 'humiliation' for Theresa May

Campaigners have won their High Court battle over Theresa May's decision to use the royal prerogative in her Brexit strategy.

In one of the most important constitutional cases in generations, three senior judges ruled the Prime Minister does not have power to use the prerogative to trigger Article 50 of the Lisbon Treaty to start the UK's exit from the European Union - without the prior authority of Parliament.

The ruling against the Government was made by Lord Chief Justice Lord Thomas, sitting with two other senior judges in London.

The Government has been given the go-ahead to appeal against the ruling at the Supreme Court.

Judgment: R (Miller) -V- Secretary of State for Exiting the European Union

Judgment: R (Miller) -V- Secretary of State for Exiting the European Union

Unless overturned on appeal at the Supreme Court, the ruling threatens to plunge the Government's plans for Brexit into disarray as the process will have to be subject to full parliamentary control.

Government lawyers had argued that prerogative powers were a legitimate way to give effect "to the will of the people" who voted by a clear majority to leave the European Union in the June referendum.

But the Lord Chief Justice declared: "The Government does not have power under the Crown's prerogative to give notice pursuant to Article 50 for the UK to withdraw from the European Union."

The Government has been given the go-ahead to appeal against the ruling at the Supreme Court but made no immediate announcement about whether it will.

[3 November 2016 09:16 · Samuel Osborne]

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[3 November 2016 09:46 · Samuel Osborne]

A sign of things to come?

[3 November 2016 09:52 · Samuel Osborne]

[3 November 2016 10:00 · Samuel Osborne]

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The Lord Chief Justice has said the issue before the court is a "pure issue of law".

[3 November 2016 10:04 · Samuel Osborne]

[3 November 2016 10:05 · Samuel Osborne]

[3 November 2016 10:08 · Samuel Osborne]

Campaigners have won their High Court battle over Theresa May's decision to use the royal prerogative in her Brexit strategy.