One of the key takeaways from this report is the number of WhatsApp messages and emails that Sue Gray has unearthed.

Martin Reynolds, who was a top aide to the PM, has a particularly striking set of messages referenced in the report.

It says a No 10 adviser messaged him on WhatsApp to flag concerns about the crossover between a large gathering in the No 10 garden on 20 May 2020 and a Downing Street Covid press conference.

Martin Reynolds replied to say: "Will do my best!"

At a later date, Martin Reynolds also sent the following message to a No 10 special adviser about a news story which is not specified. The report says the message refers to the 20 May event.

In her January report, Gray also called on the government to put in place a "clear and robust policy... covering the consumption of alcohol in the workplace" - and guidance has been issued to all government departments.

But what about disciplinary action? Gray says this is "outside of the scope of this report and is for others to consider", but she does "offer a reflection".

She says: "While there is no excuse for some of the behaviour set out here it is important to acknowledge that those in the most junior positions attended gatherings at which their seniors were present, or indeed organised.

"I have no doubt that they will have taken the learning from this experience and, while this is not a matter for me, I hope this will be taken into account in considering any disciplinary action."

Image source, PA Media

Now Sue Gray's report has been published (and we'll continue to bring you more details from that), how are we expecting the rest of the day to unfold?

We have had it confirmed by the Commons that the prime minister will give a statement at 12:30 BST (though be prepared for this to slip if Prime Minister's Questions gets feisty at midday).

We also know Boris Johnson will attend a meeting of his backbench Tory MPs - known as the 1922 committee - at 17:00.

But we now think it is likely the PM will also give a press conference later.

No more detail as of yet, but we will let you know as soon as there is.

In the final lines of her report Gray says: "Many will be dismayed that behaviour of this kind took place on this scale at the heart of government."

She says the public "have a right to expect the very highest standards of behaviour in such places and clearly what happened fell well short of this".

But Gray adds: "It is my firm belief, however, that these events did not reflect the prevailing culture in government and the Civil Service at the time.

"Many thousands of people up and down the country worked tirelessly to deliver in unprecedented times.

"I remain immensely proud to be a civil servant and of the work of the service and the wider public sector during the pandemic."

Downing Street has just issued this photograph of the prime minister reading the report - he is due to face MPs at Prime Minister's Questions in just over 15 minutes.

Gray says she is "pleased progress is being made" in addressing issues she raised in her interim report back in January.

She adds: "I commented on the fragmentary and complicated leadership structures in No 10.

"Since my update there have been changes to the organisation and management of Downing Street and the Cabinet Office with the aim of creating clearer lines of leadership and accountability and now these need the chance and time to bed in."

The senior civil servant also pointed to her previous finding that staff had witnessed or been subjected to behaviours at work "which they had felt concerned about but at times felt unable to raise properly".

This time she adds examples, saying: "I was made aware of multiple examples of a lack of respect and poor treatment of security and cleaning staff. This was unacceptable."

But Gray again says she is "reassured to see that steps have since been taken to introduce more easily accessible means by which to raise concerns electronically, in person or online, including directly with the permanent secretary in No 10.

"I hope that this will truly embed a culture that welcomes and creates opportunities for challenge and speaking up at all levels," she says.

We've already seen some images of the 13 November 2020 leaving party for departing adviser Lee Cain, obtained by ITV News. Sue Gray's report features a series of images of the prime minister at the party, holding a glass, raising it up in a toast and smiling broadly.

On the table near him can be seen several open bottles of alcohol. Here are some of the images, which have other attendees blurred out:

Image source, .

Image source, .

Image source, .

As we've reported, Gray says many of the events she looked into "should not have been allowed to happen".

"The senior leadership at the centre, both political and official, must bear responsibility for this culture."

In the conclusion of her report, Sue Gray says her initial findings from her interim report - blaming a "failure of leadership" for the parties in Downing Street - "still stand".

She adds: "Whatever the initial intent, what took place at many of these gatherings and the way in which they developed was not in line with Covid guidance at the time.

"Even allowing for the extraordinary pressures officials and advisers were under, the factual findings of this report illustrate some attitudes and behaviours inconsistent with that guidance."

She says the police investigation shows "a large number of individuals" were involved.

We are going through the report with a fine-toothed comb right now, but here are some early lines from the conclusion of Sue Gray's report:

• "Whatever the initial intent, what took place at many of these gatherings and the way in which they developed was not in line with Covid guidance at the time"
• "The senior leadership at the centre, both political and official, must bear responsibility for this culture"
• "The public have a right to expect the very highest standards of behaviour in such places and clearly what happened fell well short of this"

There’s been a lot of speculation about what would be published in the report and what they would tell us about lockdown gatherings at Downing Street. Now we can see them at last.

Here’s the first few images from the Cabinet Room celebration of Boris Johnson's birthday in June 2020:

Image source, .

Image source, .

Image source, .

The report has just been published on the gov.uk website. You can read it here, external. We're making our way through it and will bring you updates as we go.

Daniel Sandford
Home Affairs Correspondent

Image source, Getty Images

The Metropolitan Police is being threatened with legal action over its investigation of the prime minister's alleged participation in Downing Street parties.

The action is being brought by the Liberal Democrat peer and former Metropolitan Police officer Lord Brian Paddick, and the Good Law project.

In a letter sent to Scotland Yard today, lawyers for Lord Paddick and the Good Law Project are threatening to seek a judicial review of the Met's alleged decision not to send questionnaires to the prime minister for three parties in Downing Street.

The events concerned are Lee Cain's leaving party on 13 November 2020, Captain Steve Higham's leaving party on 17 December 2020 and the leaving party of two No 10 private secretaries on 14 January 2021.

The lawyers give the Metropolitan Police until 8 June to either send the prime minister questionnaires for the three parties (or interview him) or to give full written reasons why not.

If not, the lawyers are threatening to start a judicial review.

Read more on how the police investigated Partygate

Chris Mason
Political editor

More information is starting to come through, but this time on the prime minister's upcoming statement to MPs.

He is expected to say: “I commissioned this report to set the record straight and allow us all to move on.

"I accept full responsibility for my failings. I am humbled by the whole experience.

"We have learned our lesson.”

I’m also told by a No10 source that one line in the report from Sue Gray is that she is “pleased progress is being made in addressing the issues I raised”.

Clearly we are yet to read the report for ourselves and to see her conclusions in the round.

Iain Watson
Political correspondent

It’s worth remembering that Sue Gray reached her verdict in her interim report in January.

She identified "failures of leadership" in No 10 and the Cabinet Office.

And she denounced a "serious failure to observe... the high standards expected of those working at the heart of government".

So today she unveils the evidence that led her to these conclusions.

And Boris Johnson’s critics will be poring over the report for any information that would suggest his initial assertion - that guidance was followed inside Downing Street - lacked credibility. And, in turn, that he "misled" - or lied to - Parliament.

They are hoping that this will convince some fellow MPs who have been "waiting for Gray" to submit letters of no confidence.

While it’s been a struggle for his internal opponents to garner the necessary 54 letters, they feel that once a confidence vote is called, support for the PM would evaporate.

But, of course, they are not there yet. And the tone of the PM’s response to the report could prove crucial.

We found out last month that Boris Johnson was fined for attending one rule-breaking event during lockdown - a birthday party thrown in his honour in June 2020.

A source has now told the BBC that Sue Gray's report includes pictures from that event in the Cabinet Room.

Both the PM's wife Carrie Johnson and Chancellor Rishi Sunak also attended the gathering and got fined, so could we be seeing pictures of all three of them?

Image source, Getty Images

Sue Gray is the senior civil servant tasked with investigating the Downing Street lockdown parties.

She’s a Cabinet Office employee who reports to Simon Case (and he reports to the prime minister).

Gray joined the civil service in the late 1970s and has worked under both Conservative and Labour governments.

Sue Gray’s findings about parties in Downing Street and on other government premises could have a bearing on Boris Johnson’s future as prime minister.

Under Conservative Party rules, 15% of its MPs must write letters of no confidence in him to set off a leadership challenge.

We don’t know how many MPs have done so so far, but several of those not particularly favourable to Johnson have said they are waiting for Gray’s report to come out before they reach a judgement.

Johnson is due to address his backbench MPs at a meeting of the 1922 committee this afternoon.

Of course, Gray's findings might also have a wider impact on the the prime minister’s reputation beyond his own MPs, and on the reputations of his allies and officials.

Image source, PA Media

Now we know the report has been sent to No 10, what will happen next?

Well, Downing Street has promised to publish the report in full, but the timetable is up to them.

However, all signs are pointing to a quick turnaround to allow Boris Johnson to give a statement to the Commons about it after Prime Minister's Questions (which takes place at 12:00 BST).

The leader of the Commons, Tory MP Mark Spencer, has tweeted that the PM will speak to MPs "later today".

We will bring you all the updates.