Ms Sturgeon says the judgement couldn't be starker and she adds this is not a technical or narrow defeat for the UK government.

It's a defeat on lawfulness, says the first minister, which questions the UK government's commitment to UK law.

She says the prime minister tried to prevent the UK Parliament from holding the UK government to account and questioning him.

First Minister Nicola Sturgeon begins by saying we have witnessed some astonishing developments in the last three years.

The UK government has no workable majority and Prime Minister Boris Johnson is yet to win a vote in the Commons since he took over, the first minister says.

None of this compares with what has happened today, she states.

Ms Sturgeon says the ruling is of enormous significance to this parliament and to Scotland.

"For the sake of democracy we must not allow the abnormal and unacceptable to become normal and acceptable."

A prime minister has been held to have broken the law in order to frustrate parliament, she states.

Scotland's first minister has called on Boris Johnson to resign after the Supreme Court ruled that his decision to suspend Parliament was unlawful.

Nicola Sturgeon said the ruling was the most significant constitutional judgement in her lifetime.

And she said it would be "unthinkable" for the prime minister to remain in office under the circumstances.

Mr Johnson, who is currently in the US, has told the BBC he will respect the court's ruling.

The prime minister suspended Parliament - a process known as proroguing - for five weeks earlier this month.

• Suspending Parliament was unlawful, court rules
• Live: Reaction to the Supreme Court ruling
• Why were MPs sent home in the first place?
• What just happened?

Image source, Twitter

First Minister Nicola Sturgeon will now give the Scottish government's response to the Supreme Court ruling that Boris Johnson's decision to suspend Parliament was unlawful.

Transport Secretary Michael Matheson says he is saddened by the collapse of Thomas Cook and he tells the chamber the Scottish government is working closely with the UK government and the CAA.

Mr Matheson says there are 63 Thomas Cook shops in Scotland, with 390 staff and a further 250 staff at Glasgow Airport who have been hit by the collapse.

He says PACE and KPMG will offer assistance to staff facing redundancy.

SNP MSP Sandra White asks about support for staff and customers of Thomas Cook, in light of the company ceasing trading.

Image source, Getty Images

Thomas Cook flights in and out of Glasgow Airport have been cancelled after last-minute negotiations aimed at saving the holiday firm failed.

The UK Civil Aviation Authority (CAA) said the 178-year-old tour operator had "ceased trading with immediate effect".

The last Thomas Cook flight expected to arrive in Glasgow - from Orlando in Florida - landed at 05:50.

Later arrivals were cancelled and scheduled departures from Glasgow were grounded.

Read more.

Mr Finnie highlights staff safety concerns raised by Serco employees.

Islands Minister Paul Wheelhouse says the fair work framework does apply to the tender and Serco are signed up to it.

He also says Serco has operated the Northern Isles ferry service for the last seven years.

The Green MSP goes on to highlight Serco's recent involvement in evicting asylum seekers in Glasgow, but Mr Wheelhouse says this does not create a legal basis to exclude Serco from bidding for the ferry service.

Green MSP John Finnie asks why Serco was named at the preferred bidder for the Northern Isles Ferry Services.

Image source, NORTHLINK

Serco NorthLink has been named as the preferred bidder to continue Northern Isles ferry services.

Making the £345m contract announcement, Islands Minister Paul Wheelhouse said islanders will get a 20% discount on cabin fares on Aberdeen-Kirkwall-Lerwick routes from January.

There will also be a three-year fares freeze for islander passengers, non-commercial vehicles and cabins on those routes.

Read more.

Tory MSP Maurice Golden asks about action to ensure Scotland meets the target for banning biodegradable municipal waste going to landfill.

Image source, Getty Images

According to The Herald:, external

"Less than half of household waste is being recycled in Scotland with “confusing” rules and variation between council areas blamed.

"Recycling rates in Scotland ranged from 58 per cent in Midlothian to as low as 19% in the Orkney Islands, according to a UK-wide league table of council performance in 2018.

"It comes as the Scottish Government scrapped a target to ban biodegradable municipal waste being sent to landfill by 2021 as the country is not yet fully prepared.

"Environment Secretary Roseanna Cunningham said she was 'reluctantly' pushing the cut-off date back to 2025 after it became apparent that the 2021 deadline could not be achieved 'without reliance on export options, including landfill in England'."

Image source, bbc

The main event this afternoon will be Nicola Sturgeon responding to the Supreme Court ruling, from around 2.20pm.

After lunch, topical questions will be on waste targets, Serco being the preferred bidder for the Northern Isles ferry service and the Thomas Cook collapse.

Then the constitution committee leads a debate following its report on common frameworks between the UK government and devolved administrations.

Ending the day, Labour MSP Colin Smyth will highlight Idiopathic Pulmonary Fibrosis Week.

Image source, PA Media

Image source, bbc

Major Lynn Farmer from the Salvation Army is delivering today's time for reflection.

First Minister Nicola Sturgeon responded to the ruling saying: "It's extraordinary.

"At moments like this politicians have a tendency to engage in hyperbole, but there is nothing by way of exaggeration in saying this is the most significant constitutional judgement we've heard in our lifetime.

"The Supreme Court this morning has found the prime minister acted unlawfully, that he did so effectively to evade scrutiny and accountability.

"He had no good reason for doing so, and he did all of this at a time of political and constitutional crisis."

Image source, bbc

Ms Sturgeon went on to say the court found that the UK parliament was not actually prorogued at the moment.

The first minister added: "In light of this judgement today a prime minister with any honour would tender his resignation.

"We've got a prime minister who has been found by the Supreme Court to have acted unlawfully."

She adds that to have a prime minister continue under these circumstances would be unthinkable.

The first minister says if Boris Johnson does not resign "parliament should force him out of office through a confidence vote."

Image source, EPA

The UK Supreme Court ruled unanimously that Boris Johnson's suspension of Parliament was unlawful.

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

Does this mean Parliament will be reconvened? - Ollie Andrews-Heywood

Yes, it does. The Supreme Court ruled that the prorogation was void - that is, it didn't actually take place. Parliament doesn't have to be formally "recalled".

Speaker John Bercow says he has issued instructions to ensure the House of Commons is ready to resume business as quickly as possible.

He says it will now sit on Wednesday.

Read more here.