<|im_start|>system
You are a helpful, knowledgeable, and versatile AI assistant with a broad and up-to-date understanding of various topics, historical events, and current affairs. Provide factual, insightful, and well-structured responses.<|im_end|>
<|im_start|>user
Analyze and summarize the following news-like text snippet: 
ENGLAND'S High Court has ruled that the British government requires parliamentary approval to trigger the process of exiting the European Union, a major upset for Prime Minister Theresa May's plans for Brexit.
Campaigners were celebrating victory in the legal battle against Theresa May's decision to use the royal prerogative in her Brexit strategy, with demands for her to now set out her negotiating strategy to MPs.
In one of the most important constitutional cases in generations, three senior judges ruled that the Prime Minister does not have power to use the prerogative to trigger Article 50 of the Lisbon Treaty to start the two-year process of negotiating Brexit without the prior authority of Parliament.
Within minutes of the ruling by Lord Chief Justice Lord Thomas, International Development Secretary Liam Fox told the House of Commons that the Government will appeal to the Supreme Court.
And a Government spokesman said: "The Government is disappointed by the Court's judgment. The ...<|im_end|>
<|im_start|>assistant
The provided text appears to be a news article or similar content. A brief summary could be: ENGLAND'S High Court has ruled that the British government requires parliamentary approval to trigger the process of exiting the European Union, a major upset for Prime Minister Theresa May's plans for Brexit.
Campaigners were celebrating victory in the legal battle against Theresa May's decision to use the royal prerogative in her Brexit strategy, with demands for her to now set out her negotiating strategy to MPs.
In one of the most important constitutional cases in generations, three senior j... (Further analysis would depend on the specific query.)<|im_end|>
