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Liberal Democrat leader Tim Farron says "it's a terrible shame" the courts had to be involved in the decision over the triggering of Article 50.

But he says he now wants "leadership and clarity" from Theresa May - which includes stating that the UK will remain members of the single market post-Brexit.

"For me this is not about undoing the referendum ... the problem is people voted for departure and not destination," he said.

"The important thing is to do it right," he says, adding that the UK doesn't want to be in the position of jumping out of a plane without a parachute.

He accuses the government of having no plan, of being chaotic and all over the place, adding that this "lack of leadership" is crippling business.

The UK's post-Brexit immigration rules will have to be policed mainly by employers, experts tell a Westminster committee.

Professor Roberta Guerrina, Head of Politics at the University of Surrey says the ruling may not stop Brexit, but is important because it asserts that Parliament, rather than the Government, is the supreme. Here's her reaction in full:

The Daily Politics

The Daily Politics

House of Commons
Parliament

Economic Secretary to the Treasury Simon Kirby says that in the referendum the British people were "clear that they want a new relationship with the European Union". The government is "committed to getting on with the job to make Brexit a success", including for "our world leading financial sector".

On bank passporting, he says it's "one of the key areas" and the UK is looking for a "sensible discussion" on how UK and EU markets can continue to serve each other.

A good deal is "very much in the interest" of both sides, he says.

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Former Conservative attorney general Dominic Grieve, who campaigned for Britain to remain in the EU, says there are no grounds for a second referendum.

While he believes leaving the EU is "a mistaken decision and one full of risks", he says: "We can't disregard the wishes of the majority of the people - we have to give effect to their wishes."

But he argues that the form Brexit takes "is open to interpretation", which is why Parliament needs to have the opportunity to debate it.

House of Commons
Parliament

Jonathan Reynolds, shadow economic secretary to the Treasury is winding up the debate for Labour.

He says trust in financial services is "at an all time low", so the notion that finance may suffer because of Bexit may not draw sympathy. But he says it is a crucial industry for the country.

He says that passporting is a "dealbreaker for the negotiations".

House of Commons
Parliament

SNP finance spokesperson George Kerevan says the financial sector, a "key strategic industry", is being "left in the wind" by the government post-Brexit.

He says the minister, Simon Kirby, will stand up in a bit and continue doing "a fine job of not telling us anything". 

But he says that "given the unique uncertainties" in the industry, he must tell financial institutions that there will be transitional arrangements because negotiations over financial services will not be possible within the two-year Article 50 process. 

He says that an indication from the government that they would be seeking transitional arrangements "would calm everyone down".

On Scotland, he says that the Scottish government is asking to remain in the single market, while still being part of the UK. He says this would be a "solution to the passporting problem". UK banks could trade in the EU, via their Edinburgh offices, he says.

BBC News Channel

BBC News Channel

Investment manager Gina Miller, lead claimant in the case to get Parliament to vote on whether the UK can start the process of leaving the EU, insists her win today "should not frustrate the prime minister's timetable".

She argues that "a vote to leave is a vote to leave - but how do you put that in practice".

"We have a parliamentary sovereignty that means Parliament has to have that debate," she says, adding that she wants to see Article 50 in an Act of Parliament that can be scrutinised by MPs.

House of Lords
Parliament

Shadow business spokesman Lord Mendelsohn says people from overseas working in higher education and research "who hitherto saw their futures in the UK... don't necessarily see themselves any more as staying in our country".

"What we have done is not the act of those who look outwards," he says.

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Brexit Secretary David Davis says the government sees today's judgement in the High Court as an indication that an Act of Parliament would be needed ahead of triggering Article 50.

He said a quick vote on a narrow resolution was "not available", adding that "this was a decision of the British people - that decision was taken after a six to one vote in the Commons to give the decision to the British people so that's why we're appealing it".

House of Lords
Parliament

Liberal Democrat peer Baroness Garden of Frognal says the UK could be looked on as a "nasty country".

She asks which students would want to come to a country that she describes as "loath to help those who are in distress and puts up barriers to genuine students".

She calls for students to be removed from immigration figures as they do not come to the UK to stay.

House of Lords
Parliament

Labour peer Baroness Dean, a member of the council of Nottingham University, says today's debate is not about "special interest pleading".

"It's not just about money," she says. "It's about culture, it's about expanding the boundaries of talent that we can bring together.

"This debate goes to the heart of what the United Kingdom will be after Brexit."

She claims that, if "we stumble into" Brexit, there will be "self-inflicted wounds" and adds: "We're looking desperately to the government to show leadership."

House of Commons
Parliament

SNP Edinburgh South West MP Joanna Cherry tells the House that Edinburgh's economy is "more reliant" on finance than London, or anywhere else in the UK. 

It's worth 23% of the economy in Scotland's capital, compared to 18% in London and 12% in Glasgow.

She says she is worried that other cities, including Dublin and Paris, are already trying to attract financial services jobs away from UK cities.