It has been 11 months since the privileges committee launched its inquiry into Boris Johnson to establish if he misled parliament over lockdown parties in Downing Street.
Having collected written evidence, oral hearings are set to begin later this month, and we will be able to watch live while senior figures are questioned about who knew what and when as the partygate scandal played out.
This is everything you need to know about the investigation.
How did the inquiry come about?
The end of 2021 saw a deluge of stories about rule-breaking gatherings in Number 10 and around Whitehall during the COVID pandemic.
As report after report dropped, question upon question was asked by MPs in the Commons about who was involved – and many of them were directed at the prime minister.
Mr Johnson repeatedly denied any COVID rules were broken in Downing Street.
But in April 2022, after an investigation by police and senior civil servant Sue Gray, it was confirmed a raft of gatherings had taken place.
A total of 126 fines were issued by the Metropolitan Police, including to the prime minister, his wife Carrie Johnson and then-chancellor Rishi Sunak.
MPs from all sides of the Commons questioned whether Mr Johnson had misled the Commons over what he knew – a serious breach of parliamentary rules – and they voted in favour of the privileges committee carrying out an inquiry.
Mr Johnson said he had “absolutely nothing, frankly, to hide”.
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April 2022: Johnson says ‘I have nothing to hide’
What did Boris Johnson say in parliament?
Mr Johnson was first asked about partygate stories on 1 December 2021 when facing Labour leader Sir Keir Starmer at Prime Minister’s Questions.
“As millions of people were locked down last year, was a Christmas party thrown in Downing Street for dozens of people on 18 December?” Sir Keir asked.
The then-PM replied: “What I can tell the right honourable and learned gentleman is that all guidance was followed completely in Number 10.”
Pushed again by the then-Westminster leader of SNP, Ian Blackford, Mr Johnson accused him of “talking total nonsense” about parties.
Come PMQs on 8 December, Mr Johnson kicked off the questioning with a statement after a video surfaced of Number 10 staff joking about a Christmas party.
He said he “shared the anger” of the public and was “furious” to see the clip, adding: “I apologise unreservedly for the offence that it has caused up and down the country, and I apologise for the impression that it gives.
“I repeat that I have been repeatedly assured since these allegations emerged that there was no party and that no COVID rules were broken – that is what I have been repeatedly assured.”
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December 2021: PMQs clash over No 10 ‘party’
Mr Johnson also accused both Labour and the SNP of “playing politics” when he faced questions about the video from both party leaders.
He was then asked by Labour MP Catherine West: “Will the prime minister tell the House whether there was a party in Downing Street on 13 November?” – a date when two parties were reported to have taken place, at least one of which resulted in fines.
Mr Johnson replied: “No, but I am sure that whatever happened, the guidance was followed and the rules were followed at all times.”
Who is conducting the investigation?
The privileges committee is made up of seven MPs – four Conservatives, two from Labour and one from the SNP.
The MPs are voted onto the committee by their colleagues and reflect the political make-up of the House.
Labour’s Sir Chris Bryant usually chairs the committee, but recused himself from this investigation as he had already made a number of public comments about the matter.
Instead, senior Labour backbencher and mother of the House Harriet Harman will take his place.
Image: Harriet Harman is chair of the committee
What will the inquiry involve?
The committee has been gathering and analysing written evidence after issuing a public call for it last summer.
It also requested evidence from Downing Street with a deadline of July last year, although it did not get that material until November.
The next step is to take oral evidence from those involved.
The committee has confirmed Mr Johnson will appear in front of them from 2pm on 22 March, but it has not yet announced which other individuals will be questioned.
It has confirmed the hearings will take place in public to make sure the probe is “transparent”, although requests to hear evidence anonymously or in private “will be considered on a case by case basis”.
After hearing all the evidence, the committee will compile a report of its findings.
What powers does the committee have?
Technically, the only powers the committee has is to issue that report to the Commons for MPs to consider.
In its findings, it can conclude that an individual has been found to have “committed a contempt” in misleading the House and it can recommend sanctions, ranging from an oral or written apology through to suspension for a specified period or even expulsion from the Commons.
But it will fall to MPs to decide whether to accept the findings of the report and to follow through with any sanction.
If MPs agree to a suspension of 10 sitting days or 14 calendar days upwards, it would trigger a recall petition for Mr Johnson, allowing his constituents in Uxbridge and South Ruislip to vote on whether to hold a by-election for his seat.
Donald Trump has criticised Vladimir Putin and suggested a shift in his stance towards the Russian president after a meeting with Volodymyr Zelenskyy before the Pope’s funeral.
The Ukrainian president said the one-on-one talks could prove to be “historic” after pictures showed him sitting opposite Mr Trump, around two feet apart, in the large marble hall inside St Peter’s Basilica.
The US president said he doubted his Russian counterpart’s willingness to end the war after leaving Rome after the funeral of Pope Francis at the Vatican.
In a post on his Truth Social platform, he said “there was no reason” for the Russian president “to be shooting missiles into civilian areas, cities and towns, over the last few days”.
Image: The two leaders held talks before attending the Pope’s funeral
He added: “It makes me think that maybe he doesn’t want to stop the war, he’s just tapping me along, and has to be dealt with differently, through ‘Banking’ or ‘Secondary Sanctions?’ Too many people are dying!!!”
The meeting between the US and Ukrainian leaders was their first face-to-face encounter since a very public row in the Oval Office in February.
Mr Zelenskyy said he had a good meeting with Mr Trump in which they talked about the defence of the Ukrainian people, a full and unconditional ceasefire, and a durable and lasting peace that would prevent the war restarting.
Other images released by the Ukrainian president’s office show Sir Keir Starmer and French President Emmanuel Macron were present for part of the talks, which were described as “positive” by the French presidency.
Mr Zelenskyy‘s spokesman said the meeting lasted for around 15 minutes and he and Mr Trump had agreed to hold further discussions later on Saturday.
Image: The world leaders shared a moment before the service
Image: Donald Trump and Volodymyr Zelenskyy meet in the Basilica
But the US president left Rome for Washington on Air Force One soon after the funeral without any other talks having taken place.
The Ukrainian president’s office said there was no second meeting in Rome because of the tight schedule of both leaders, although he had separate discussions with Mr Starmer and Mr Macron.
The French president said in a post on X “Ukraine is ready for an unconditional ceasefire” and that a so-called coalition of the willing, led by the UK and France, would continue working to achieve a lasting peace.
There was applause from some of the other world leaders in attendance at the Vatican when Mr Zelenskyy walked out of St Peter’s Basilica after stopping in front of the pontiff’s coffin to pay his respects.
Image: Donald Trump and the Ukrainian president met for the first time since their Oval Office row. Pic: Reuters
Sir Tony Brenton, the former British ambassador to Russia, said the event presents diplomatic opportunities, including the “biggest possible meeting” between Mr Trump and the Ukrainian leader.
He told Sky News it could mark “an important step” in starting the peace process between Russia and Ukraine.
Professor Father Francesco Giordano told Sky News the meeting is being called “Pope Francis’s miracle” by members of the clergy, adding: “There’s so many things that happened today – it was just overwhelming.”
The bilateral meeting comes after Mr Trump’s peace negotiator Steve Witkoff held talks with Mr Putin at the Kremlin.
They discussed “the possibility of resuming direct negotiations between Russia and Ukraine”, Kremlin aide Yuri Ushakov said.
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On an extraordinary day, remarkable pictures on the margins that capture what may be a turning point for the world.
In a corner of St Peter’s Basilica before the funeral of Pope Francis, the leaders of America and Ukraine sit facing each other in two solitary chairs.
They look like confessor and sinner except we cannot tell which one is which.
In another, the Ukrainian president seems to be remonstrating with the US president. This is their first encounter since their infamous bust-up in the Oval Office.
Image: The two leaders held talks before attending the Pope’s funeral
Other pictures show the moment their French and British counterparts introduced the two men. There is a palpable sense of nervousness in the way the leaders engage.
We do not know what the two presidents said in their brief meeting.
But in the mind of the Ukrainian leader will be the knowledge President Trump has this week said America will reward Russia for its unprovoked brutal invasion of his country, under any peace deal.
Mr Trump has presented Ukraine and Russia with a proposal and ultimatum so one-sided it could have been written in the Kremlin.
Kyiv must surrender the land Russia has taken by force, Crimea forever, the rest at least for now. And it must submit to an act of extortion, a proposed deal that would hand over half its mineral wealth effectively to America.
Image: The world leaders shared a moment before the service
Afterwards, Zelenskyy said it had been a good meeting that could turn out to be historic “if we reach results together”.
They had talked, he said, about the defence of Ukraine, a full and unconditional ceasefire and a durable and lasting peace that will prevent a war restarting.
The Trump peace proposal includes only unspecified security guarantees for Ukraine from countries that do not include the US. It rules out any membership of Ukraine.
Ukraine’s allies are watching closely to see if Mr Trump will apply any pressure on Vladimir Putin, let alone punish him for recent bloody attacks on Ukraine.
Or will he simply walk away if the proposal fails, blaming Ukrainian intransigence, however outrageously, before moving onto a rapprochement with Moscow.
If he does, America’s role as guarantor of international security will be seen effectively as over.
This could be the week we see the world order as we have known it since the end of the Second World War buried, as well as a pope.