Prime Minister Boris Johnson will make a statement about Sue Gray's report in parliament at 15:30 GMT, the House of Commons has announced.

As we've been reporting, Johnson has been handed Gray's initial report into parties held in Downing Street when Covid restrictions were in place.

For weeks, there has been fevered speculation about the political consequences of Sue Gray's report for Boris Johnson.

Gray's findings are considered crucial to Johnson’s political future as many Conservative MPs have suggested they will seek to remove him from office if they are damning.

Many Tory MPs have said they are waiting on the report before deciding whether to submit letters of no confidence in Johnson.

At least 54 must write to Sir Graham Brady, chairman of the backbench 1922 Committee, to trigger a vote of no confidence.

If Johnson lost that vote, he would be barred from a leadership contest that would determine who would succeed him as PM.

So, the political stakes are high. But, after the Met Police requested "minimal references" to events they are investigating, some MPs fear that key details of the report could be ommitted.

Some analysts believe that could soften the political blow for the PM.

Jessica Parker
BBC political correspondent

My impression is that, obviously given the request that the Metropolitan Police has made, there needed to be a little bit of a relook at the Sue Gray report in terms of what it will say and how fulsome it will be.

So it might be down the line we eventually get the full version.

But it's difficult to say because obviously we're not going to have an original copy to compare to the copy that presumably we'll get sight of in the next few hours.

It will be made public. We expect something to be published later today, then of course what we may see today is the prime minister go to the House of Commons as well.

He will go there at some point, but whether it will be today or in the coming days, we don't know. It seems most likely today.

So a couple of big things to look forward to. Clearly once it is published, we're all going to give it a big old read.

Earlier this morning Prime Minister Boris Johnson was out-and-about at a port in Essex, where he answered questions about the parties investigation.

Asked repeatedly by the BBC’s Nick Eardley if he thought he had done nothing wrong, Johnson urged people to wait for Sue Gray's report.

When asked about possible omissions from the report, Johnson offered no comment but added: "Of course I stick absolutely to what I've said in the past."

No 10 has previously pledged to publish the report "as they receive it".

But some MPs fear key details may be omitted after the Met Police requested "minimal reference" to certain events after launching its own investigation.

Last week MP Sir Christopher Chope accused the Met Police of an "abuse of power", amid concerns Gray will now leave out crucial findings.

Jessica Parker
BBC political correspondent

We have been waiting quite a while. Well the wait may nearly, kind-of, be over.

What we've had from the Cabinet Office this morning is a statement saying, we can confirm Sue Gray has provided an update on her investigations to the prime minister.

That immediately begged the question as to: What is an update, what does this mean?

Putting in an initial couple of calls, my understanding is a version of her report has gone into Downing Street but one that takes account of that request from the Metropolitan Police for minimal reference to be made in her report relevant events that the police are investigating.

We're hearing that Sue Gray has handed a version of her inquiry to the prime minister. But it's described in a statement as an "update" on her investigation.

Our political editor Laura Kuenssberg notes the significance of this - saying the statement carefully spells out that today won't be the full findings.

The implication is that Gray has "a lot more to say" but can't because of the ongoing Met Police investigation, she says.

A key question for Johnson will be whether the government will commit to publishing the full findings at a later date, she adds.

Image source, PA Media

As we've been hearing, Prime Minister Boris Johnson has received a report into alleged lockdown-breaching parties in Downing Street.

So, what is it and why haven't we seen it yet?

What is it: Gray, a senior civil servant, is tasked with writing a report into what happened at a number of gatherings at Downing Street and other locations in Whitehall during lockdowns.

What it covers: Gray is expected to give a factual account with reference to the Covid restrictions and guidance at the time of each event - this does not necessarily mean that she will say whether there have been breaches of it.

What will be published: No 10 has pledged to publish the report "as they receive it". The prime minister will not have a veto over what is published.

Why the wait: The Metropolitan Police has announced its own investigation and says it wants Gray's report to make "minimal reference" to the events it is looking into, in order "to avoid any prejudice". It has not, however, called for any delay to publication.

Hello and welcome to our live coverage of the official investigation into alleged parties in Downing Street and Whitehall when Covid-19 restrictions were in place.

Boris Johnson has now received the report from civil servant Sue Gray. A day of political turbulence is anticipated as he is expected to publish its findings.

To start with, here’s what you need to know this morning:

• Opposition parties and some Tory MPs are demanding the report be published in full
• But doubt has been cast on how complete Gray's report will be after the Metropolitan Police asked for "minimal reference" to certain events after launching its own investigation
• Earlier Johnson refused to be drawn on whether the report would be a "whitewash" and said he sticked "absolutely to what I've said in the past"
• He is expected to make a statement in parliament soon after receiving the report

Follow our updates as we keep you posted on all the latest developments from Westminster.