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Boris Johnson is a populist and "lacks the integrity to be leader", says David Leakey, former Black Rod - a senior officer in the House of Lords.

"If he was the leader of any public company - a university, an NHS trust, a charity - having done something unlawful and having, as the courts inferred, misled Parliament and the people and the Queen... any other leader of any other organisation would resign," he says.

"In my view he's not properly a leader."

Today Programme
BBC Radio 4

Former Conservative chancellor Ken Clarke - who's been talked of as a possible caretaker prime minister - says he won't be joining the calls for Boris Johnson to resign.

He says the "most important thing is to decide as quickly as we can how we are going to move forward on Brexit".

He believes MPs need to produce a majority in Parliament on a cross-party basis to get a "preliminary" deal through and then have an election and have a government that explains what its long-term plans are.

Image source, Getty Images

The Brexit Party's Nigel Farage says Boris Johnson's decision to suspend parliament was "appalling".

"The political decision to call a Queen's Speech, whilst in most years would be a normal thing to do, has had the catastrophic effect of uniting the remainers, uniting the establishment and it's allowed those who've spent three years trying to stop Brexit from happening now claiming they've got democracy on their side," he says.

So from every way you look at this, politically it was an appalling decision."

Today Programme
BBC Radio 4

Leader of the Commons Jacob Rees-Mogg told cabinet ministers that the action by the court had amounted to a "constitutional coup", sources have told the BBC.

Lord Sumption, a former Supreme Court judge, argues it is nothing of the sort.

The government itself has sought to undermine the democratic legitimacy of public decision-making by dispensing with the idea that ministers are answerable to parliament, he says.

The Supreme Court has invented a brand new rule that is undoubtedly controversial - the effect of which is to reinstate Parliament at the heart of the decision-making process, he says.

"And that is not undermining it at all - nor is it a coup.

"It is is simply replacing what ought to have happened by convention," he says.

Did the prime minister mislead the Queen? Could Boris Johnson face criminal prosecutions? Will Boris Johnson now face a no confidence vote?

We've answered a sample of the questions we received from readers on this subject here.

Boris Johnson should offer his resignation and the UK should have a general election, says Brexit Party leader Nigel Farage.

"If the highest court in the land says you've acted unlawfully, I think as a matter of honour you have to at least offer your resignation to the House of Commons," he says.

"We need to have a general election, we need the public to express their will."

He adds that it "would not be Brexit" if Mr Johnson chooses to pursue Theresa May's deal in negotiations with Brussels.

Today Programme
BBC Radio 4

Liberal Democrat Ed Davey says Parliament now needs to force the PM to extend Article 50 (the legal mechanism for leaving the EU) to get no deal off the table.

"It might need an extra bill, who knows?" he says.

Should there be a vote of no confidence in the PM, he says he does not believe Labour leader Jeremy Corbyn could command a majority in Parliament and would rather see Labour's Harriet Harman or Conservative Ken Clarke seek to.

"Then we could probably proceed quite quickly to a general election," he says.

Chris Mason
Political Correspondent

MPs across the House are making it up as they go along. They want to cause as much trouble as they can for the prime minister, but they've all got their competing views.

Some want to try to bring down Boris Johnson and install some sort of caretaker PM, but Labour are not keen on that idea. Labour don't want to back the idea of a vote of confidence.

Instead, they say their focus has to be ensuring that Brexit is delayed again and forcing Boris Johnson to request an extension against his wishes.

For all this noise, some of the big fundamentals remain the same. As has so often been the case in this Brexit process, you get a huge amount of noise, you get a huge amount of jeopardy. and then a few days later you think, 'What has actually changed?' And often the answer to that is: not an awful lot.

"Mr Johnson again is trying to play down the significance of this," says businesswoman Gina Miller, one of those who brought the case against the prime minister.

"He has broken the law... now he's trying to deflect blame".

She adds that MPs have to "step up" when they return today.

"When they sit back again today... they have got to be bold, they have got to be brave, they have got to come to a solution."

Ross Hawkins
Political correspondent

Expect a flurry of urgent questions from opposition MPs today, with some wanting to see the Attorney General's legal advice.

There is also a plan to summon the prime minister to answer questions about his relationship with the businesswoman Jennifer Arcuri. (Read more about that here)

A vote of confidence is not likely but, beyond the coming 24 hours, we may see a whole new rebel Bill.

The opposition parties must come together to remove Boris Johnson and install a "caretaker" administration to call an election, says the SNP's Westminster leader Ian Blackford.

Mr Blackford says a motion of no confidence should be brought "as soon as practically possible".

Asked whether Labour leader Jeremy Corbyn was the right person to take over in such a circumstance, Mr Blackford said: "We're only talking about putting somebody in place in order to call an election, and on that basis I wouldn't be opposed to that."

Laura Kuenssberg
BBC political editor

Image source, Getty Images

"He has completely lost control of the process."

That's how one of the prime minister's cabinet colleagues summed up Boris Johnson's position as he flies back to face Parliament.

Mr Johnson is likely to end up at the despatch box on Wednesday, where he will have the rulings of the Supreme Court brandished at him.

The opposition parties calling on him to quit. A flurry of urgent demands for the government to answer questions about its plans for Brexit. And all that, before the profound embarrassment of having been found to have broken the law.

Downing Street at this stage seems to have no intention of doing anything other than toughing this out.

And Number 10 may choose to promote the plot of a prime minister, battling against the mighty establishment to keep his Brexit promise believing that will appeal to many leave voters, and can tune in to the frustration many members of the public feel at political failure.

Continue reading here.

BBC Radio 5 Live

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Now that the Supreme Court has ruled that Boris Johnson's prorogation of Parliament was unlawful, what does it mean for companies preparing for Brexit on 31 October?

"The big picture right now is that the prospect of no deal is significantly receding," says Ian Anderson, political strategist and executive chairman of public relations agency Cicero.

"I think that is the most important thing to be able to say to businesses right now," he tells Wake Up to Money. "Because of Boris Johnson's own strategy, because of this prorogation which hasn't been a prorogation - it has been ruled to be unlawful as if it hasn't happened, something he didn't even need to do - and because of the legislation that MPs passed the bill to try and block a no-deal [Brexit] he's kind of boxed in.

"So we may or we may not be leaving on 31 October. For most businesses, taking a no-deal Brexit off the table is better news."

Jonny Dymond
BBC royal correspondent

Image source, PA

What happened on Tuesday was painful for the Palace.

It wasn't just Boris Johnson's request for a prorogation that was found by the Supreme Court to be unlawful, void and of no effect.

It was also the Order in Council, the legal mechanism that the Queen personally approves, that was found to be unlawful, void and of no effect. And, said the Supreme Court, it should be quashed.

The Queen has been dragged by the PM's unlawful prorogation into the place where for decades politicians have agreed she should never be - right into a domestic political argument.

As the Supreme Court ruling hacked a new path through Britain's system of government, brushing ancient royal powers to one side, from Buckingham Palace came - nothing.

Continue reading here.

Welcome to our live coverage of the fallout from yesterday’s historic Supreme Court ruling.

MPs and peers are returning to Parliament later after judges ruled unanimously on Tuesday that its suspension was unlawful.

Boris Johnson is returning early from a UN summit in New York, while Labour cut its conference short.

Commons Speaker John Bercow has said there will be "full scope" for urgent questions and ministerial statements.

It looks set to be a busy day, but we will be keeping you up-to-date and informed on all the developments.

That's all from us for today after a momentous ruling at the Supreme Court.

Catch up on the bits you may have missed with our video round up.

Jessica Parker
BBC political correspondent

Tomorrow Boris Johnson is going to have to face the music one way or another.

It’s not clear yet whether he will come to the Commons chamber himself or whether a senior member of the government will.

But what is clear is that MPs from opposition parties and rebel Tories will use tomorrow to try and ask some pretty difficult questions.

Will there be a vote of no confidence? It looks like parties are a little hesitant to go there yet.

If they call a vote of no confidence and no other government is formed, Mr Johnson could set the date of a general election for 1 November and dissolve Parliament over the Brexit departure date.

That makes some MPs nervous.

But a General Election is still very much around the corner - it’s more a matter of when than if.

Image source, Getty Images

Boris Johnson has been meeting UN Secretary General Antonio Guterres in New York.

The prime minister is due to fly back to the UK after he addresses the UN General Assembly.