Blackford says Westminister parties are already celebrating the Supreme Court's decision this morning, but their "thoughtless triumphalism" won't last long.

The judgement raises questions about the future of the UK, he says.

He says the biggest question of all is how the PM could ever again "repeat the myth" that the UK is a voluntary union.

Blackford asks if the PM will amend the Scotland Act to ensure the Scottish people "have the right to choose our future". If not, is he "deliberately choosing to deny democracy?", he asks.

He says today's decision casts focus on the democratic decisions of the Scottish people since 2014.

"How many times do the people of Scotland have to vote for a referendum before they get it?", he asks.

Scotland didn't vote for Brexit, he says, or the "new age of Tory austerity" or to elect the PM, he says.

Scottish Secretary Alister Jack responds by saying he respects the Supreme Court's "clear and definitive" ruling on the Scottish referendum.

People want to see the Scottish government and parliament focus on issues that matter to them, he says, not on constitutional division.

He says the UK government wants to work with the Scottish government on vital areas like tackling the cost of living, growing the economy and leading the international response to the war in Ukraine.

Jack calls for Scotland to set aside divisive constitutional issues and work together, focusing all attention on key issues that matter to the people of Scotland.

Image source, House of Commons

SNP leader Ian Blackford asks the government to make a statement on the decision of the Supreme Court and the rights of the Scottish Parliament to call for an independence referendum.

Image source, House of Commons

Labour MP Olivia Blake notes that tomorrow marks one year since 32 people lost their lives crossing the Channel. "Families are still waiting for answers... Why has this investigation taken so long? Will [the PM] commit to a full public inquiry?"

Blake also asks if Sunak recognises that this tragedy would not have happened if "safe and legal routes" existed.

Sunak replies that every life lost in the Channel is a tragedy, but this is why it's important that the cycle of exploitation by criminal gangs is tackled, and that's what the home secretary is focused on.

Selby and Ainsty Tory MP Nigel Adams says bus services are under threat in his constituency and asks the prime minister what he will do to ensure essential services are not withdrawn at short notice.

Sunak responds by saying he shares the same challenges as Adams in ensuring that constituents in rural areas have access to the bus services they need.

He says the chancellor has allocated funding for extra services across the country and he looks forward to working with Jeremy Hunt to ensure that money finds its way to rural areas to provide connectivity.

Image source, House of Commons

SNP MP Philippa Whitford says the "disaster" of Brexit was "forced on Scotland against our will".

She asks if the PM still claims the UK is a voluntary union, can he explain the democratic route by which the people of Scotland can make a choice over their own future.

Sunak says the UK is a collaborative and constructive union that is delivering for the people of Scotland.

He mentions investment the government has made in aerospace, advanced manufacturing and space in Scotland.

The PM adds: "Those are the types of activities that will bring tangible benefit to the people in her region and that's the right focus for the government."

Image source, House of Commons

Ed Davey, the leader of the Lib Dems, brings up the issue of mortgages and cites a constituent who spoke to him in tears becuase she was struggling to pay for her home.

He asks if the prime minister will bring in a new mortgage protection fund paid for "by his tax cuts to the banks".

Sunak responds by saying last week's Autumn Statement will help families up and down the country because it's the right plan to tackle inflation, limit the increase in mortgage rates and ensure confidence in the economy.

He also mentions specific help such as low-interest loans, adding that the chancellor will meet with mortgage lenders in the coming weeks.

Jonathan Blake
BBC political correspondent

Scrappy exchanges on the economy dominated the first part of PMQs.

Sir Keir Starmer sought to blame the Conservatives for the bleak picture of the UK in recession - with low economic growth compared to other countries.

Rishi Sunak drew cheers from his own benches but sarcastic laughter from those opposite by claiming the UK was actually doing better than many big economies.

The prime minister seemed more pumped up at this parliamentary showdown than he has in previous weeks, but was ticked off by the speaker for answers that went on too long. The Labour leader was also warned to keep it short.

These two leaders seem to relish debate on the economy, and we’ll hear a lot more of it between now and the next election.

Image source, House of Commons

Sunak says he is pleased Scotland has one of most powerful devolved parliaments in the world.

And he says he wants to work together with First Minister Nicola Sturgeon to deliver for the people of Scotland - on growth, freeports, and extra money for public services.

Blackford says the PM can't claim to respect the rule of law and then deny democracy in the same breath.

If democracy and elections matter, then mandates matter, Blackford says.

The Scottish Parliament now has the biggest majority for an independence referendum, he says, while the PM doesn't "even have a personal mandate to sit in 10 Downing Street".

"What right does a man with no mandate have to deny Scottish democracy?", he asks.

Sunak responds to the SNP's Ian Blackford by saying he respects the Supreme Court's ruling that the Scottish government can't hold a referendum without consent from the UK government, and says now is the time for politicians to work together.

He cites the challenges that lie ahead, including the economy, supporting the NHS and supporting the Ukraine.

Image source, House of Commons

SNP leader at Westminster Ian Blackford says the PM "can't claim to respect the rule of law and deny democracy in the same breath".

He says that the SNP has won eight elections in a row since 2014. "The Scottish Parliament has the biggest majority for an independence referendum in the history of devolution," Blackford says, questioning Sunak's mandate.

Sunak says in the summer, he told the country what it needed to hear even when it was difficult, while Starmer told his party what it wanted to hear when he stood for the Labour leadership.

Starmer, he says, won't stand up to the unions, and tried to have a second Brexit referendum, Sunak adds - saying that meanwhile he as prime minister will deliver for the country.

Starmer says the PM hasn't got a plan on growth and influential voices in business say so.

He says Sunak won't push through planning reforms and is killing off the dream of home ownership.

He says the PM is too weak to take on his party and too weak to take on vested interests.

Starmer asks - to loud jeers - why Tory governments always "clobber working people".

Sunak responds to Starmer by attacking Labour, saying the party does not have a plan or substance.

You can only deliver for the NHS if you have a plan for the economy, he adds, saying the government has both and Labour has neither.

Image source, House of Commons

Starmer says: "Scrapping the non-dom status would allow us to train 15,000 doctors every year - that's what Labour would do."

"We can carry on handing out tax breaks to the super-rich or we can live in a society where people don't have to go private to get a doctor's appointment," he adds.

In reference to comedian Joe Lycett's threat to shred £10,000 in protest over David Beckham's role as an ambassador for the Qatar World Cup, Starmer says that Sunak "shreds £10,000 every other minute propping up" oil companies. "Which does he think is the more absurd?"

Sunak says last week the government announced record increases in NHS funding for more doctors, nurses, scans and operations.

Starmer says the PM has not asked non-doms to pay a penny more.

"That's £3.6bn thrown away because he won't make them pay their taxes here," he says.

He asks how many extra doctors Britain could afford with that money.

Image source, House of Commons

Sunak replies by saying Labour had 13 years to address this issue and did nothing, rather it was the Conservatives who tightened the rules on non-doms.

Starmer's plans for this issue would end up costing Britain money, the PM adds.

He goes on to say the government will deliver a record increase in the living wage and protect millions from rising energy bills.

Starmer says: "There is only one party that has crushed the economy and it is sitting there," and points at the Tory benches.

He adds that "because of changes [Sunak] has made, a typical household will end up with tax increases of £1,400."

"Contrast that to a super-wealthy non-dom... How much more has he asked them to pay?", Starmer asks.

Read more: What is a non-dom?