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David Gauke, the former justice secretary who was expelled from the Tory parliamentary party for rebelling over Brexit, tells the BBC Boris Johnson could survive as leader if he changes course.

He says of Parliament's suspension: "It was always clear it was politically wrong and now it’s clear that it was unlawful. That is clearly very damaging for the prime minister and I hope he will change course.

"I think the prime minister can survive but he needs to apologise for what he has done earlier this month in terms of proroguing Parliament.

"I think he needs a change of strategy and a change of strategist: the people who advised him down this path will need to leave Number 10."

But he says Mr Johnson's resignation would not help the country at this crucial time.

"I don’t think the country particularly needs another Conservative Party leadership crisis," he says.

The chair of the Bar Council, Richard Atkins QC, has called on commentators not to use "inflammatory language" about the judges or lawyers involved in the Supreme Court case.

Mr Atkins, who leads the association which represents barristers in England and Wales, said: "It is even more important than ever that those in positions of power think very carefully about what they say."

He called for "a period of calm reflection" following today's ruling, adding that lawyers "do not express personal opinions but act on behalf of their clients".

His comments follow a newspaper article last weekend in which a No 10 source was quoted talking about the judiciary "taking sides" over Brexit.

The House of Lords will resume sitting tomorrow afternoon, the Lord Speaker has said.

Lord Fowler said peers will return to the Lords on Wednesday at 15:00 BST and will also sit on Thursday at 11:00.

"The House of Lords performs a vital constitutional function," he added. "It holds the government of the day to account and will continue to do just that."

Speaker John Bercow has already confirmed MPs would be asked to return to the House of Commons tomorrow at 11:30 BST.

Laura Kuenssberg
BBC political editor

Before everything gets swept up in a force 10 political storm, stop for a moment to think about what has just happened.

The highest court in the land has just ruled that the serving prime minister broke the law. He gave the Queen advice that was unlawful.

Therefore his decision to suspend Parliament was also against the law, so is now null and void.

Short of the inscrutable Lady Hale, with the giant diamond spider on her lapel, declaring Boris Johnson to be Pinocchio, this judgement is just about as bad for the government as it gets.

Read more from Laura here.

Image source, PA Media

Boris Johnson should resign after the Supreme Court found his suspension of Parliament is unlawful, First Minister Mark Drakeford says.

"The prime minister tried to play fast and loose with our constitution. The unanimous decision by the Supreme Court is a huge victory for the rule of law.

"Parliament was never prorogued and must now hold this government to account."

He added: "Any normal prime minister would - as a matter of honour - tender their resignation after such a unanimous verdict from the UK's highest court.

"It is the final straw in a pitiful episode for the country."

Read more reaction from Wales here.

BBC Radio 4

Gina Miller, who brought one of the legal challenges against the government, has said she thinks Boris Johnson's reaction to Tuesday's judgement is "shocking".

She told BBC Radio 4's World at One programme: "What is shocking to me is how the prime minister is playing this down.

"He cannot just disagree with 11 of the most senior judges in our country who have just ruled that he did something unlawful and then think that he will not have to face the music.

"It is quite shocking that he thinks he can downplay this. This is a significant moment."

Laura Kuenssberg
BBC political editor

The Supreme Court's judgement is a ginormous political blow.

This was not the expectation of the government lawyers at the beginning of this process.

They thought the judges, to start with, would hang back from tip-toeing into this unbelievably political minefield.

Judges do not like getting involved in politics.

But as the case wore on it became clearer and clearer that the government’s side of the argument was likely to be the losing one.

This judgement goes further than had been many people’s expectation and it is just about as bad as it gets.

MPs will be back in Parliament tomorrow.

What will they do? We do not know precisely.

But the rebel alliance is likely to seek to get control of the order paper, control of what is going on in the Commons.

And they are likely to use this opportunity to dictate Brexit policy and what happens next every day for the foreseeable future.

It could leave Boris Johnson’s government, as one cabinet minister told me, sort of like hostages.

Hold on tight.

They have to get the questions and answers ready...

Katya Adler
Europe Editor

My contacts tell me that technical talks between the UK and the EU on renegotiating a Brexit deal will continue because they say that time, those negotiations, are never wasted.

Of course, behind the scenes the EU wants to know will Boris Johnson stay in his job? Will there suddenly now be a new general election?

But for now they are concentrating on those technical talks. Their fundamental question remains unchanged: if there is a new Brexit deal, if a compromise is found between the UK and the EU, will that new deal have a majority in Parliament? Will that deal get through?

And the EU says that question today - as yesterday - remains unchanged, whatever happened in the Supreme Court.

James Landale
Diplomatic correspondent

"That [statement from Boris Johnson] was very much a holding position, the question he [Mr Johnson] has got to answer now is does he actually collapse his day's events?

"He's got a big schedule here: meeting lots of other world leaders including, Donald Trump and the President of Iran; he's due to give a speech here at the UN General Assembly later on today - so he has a packed schedule.

"He's going ahead with the business breakfast at the moment, so he's giving the impression of business as usual but he's still got to workout what the fundamental response of the government will be.

"He says there will still be a Queen's Speech. Well, how will he have a Queen's Speech without Parliament being prorogued first? Because, normally, that is what happened.

"But we are not in normal circumstances.

"So clearly, at the moment, the response from Downing Street here - many thousands of miles away - trying to workout just what's happening back on the ground in the UK is a note of defiance and a degree of push-back."

Chris Morris
BBC Reality Check

The Supreme Court was at pains to emphasise that its judgement was nothing to do with the merits of Brexit.

So what does it mean for Boris Johnson’s promise that the UK will leave the EU on 31 October come what may?

It certainly undermines the authority of a prime minister who was already under pressure.

But it doesn’t fundamentally alter the fact that his best hope lies in securing a deal with other EU leaders at their summit in Brussels on 17 October, and then persuading the House of Commons to back it.

That remains a tall order. The two sides are poles apart on the detail of any potential revised deal.

The prime minister’s other declared option – to take the UK out with no Brexit deal in defiance of the law – looks less likely.

If he were to try to ignore the law, the Court would almost certainly be asked for its opinion again.

If MPs decide to call a vote of no confidence, of course, and if they win it, then we could be heading for a general election and possibly a referendum.

An election looks more likely than ever, and the fate of Brexit could hang on its outcome.

He adds: "The PM is expected to fly home overnight tonight, a few hours earlier than planned, so that he can be in Parliament tomorrow."

Continuing his comments, the PM said: "What we will certainly do is ensure Parliament has plenty of time to debate Brexit.

"Parliament's been debating Brexit for three years solidly, now's the time for us to get a deal, come out of the EU on October 31, and that's what we're going to do."

He added: "There are basically a lot of people who want to stop this country coming out of the EU and we have a Parliament that is unable to be prorogued, doesn't want to have an election and I think it's time we took things forward."