BBC News Summary
Political editor
We know this report will just be the initial findings - the first version, not the full fat version of all the information that Sue Gray has gathered.
That's not to say it won't make some quite stringent conclusions for Downing Street.
I think there will be identification of what will be described as a "drinking culture" and a lack of leadership in Downing Street.
But it will not give the full chapter and verse of everything that was going on behind the black door during lockdown.
Nor will it detail the worse incidences of rule-breaking in the building where people were setting rules at the same time.
Right now, No 10 might be hoping that this will at least - as far as Sue Gray is concerned - signal the end of the beginning.
I imagine the prime minister will apologise again, accept her findings in full and make some promises about trying to clean up the culture in Downing Street.
But while Westminster loves nothing more than intrigue about process, the point of this really is many members of the public may have already made up their mind about what happened, about Johnson's own involvement, and how how much this matters to them.
The breathless Westminster process-ology may preoccupy the postcode of SW1, but that overall big picture is what matters, not the dotted i's or crossed t's that may prove to be the least of Downing Street's worries.
Jessica Parker
BBC political correspondent
One of the most serious things that could come from the investigation would be if the prime minister was found to have misled the House of Commons.
As well as of course, people will want to know if he personally broke the rules.
Some of his defence has been: I thought I was at a work event, nobody told me - basically pleading ignorance saying he did not know. So how can you prove that? How can you prove what might have been in Boris Johnson's mind?
I think Sue Gray's not likely to be diving into the mind of Boris Johnson but reaching more factual based conclusions.
I think something to watch out for is whether there is any suggestion or evidence that he misled the House of Commons because that is, in parliamentary politics, a pretty serious event.
- An initial version of Sue Gray's highly-anticipated report into Downing Street parties during lockdown has been published
- She finds that some lockdown gatherings in government represent a "serious failure" to observe what was asked of the public
- She says there were "failures of leadership and judgment by different parts of No 10 and the Cabinet Office"
- Several gatherings "should not have been allowed to take place or to develop in the way that they did", she adds
- Prime Minister Boris Johnson will address the Commons at 15:30GMT
- The report is seen as preliminary because the Met Police asked for it to make "minimal reference" to events it is investigating
- Senior Tories have joined opposition MPs in demanding the report be published in full
- Gray's findings are crucial for Johnson as they could see Tory MPs force a vote on his leadership
Political editor
We know this report will just be the initial findings - the first version, not the full fat version of all the information that Sue Gray has gathered.
That's not to say it won't make some quite stringent conclusions for Downing Street.
I think there will be identification of what will be described as a "drinking culture" and a lack of leadership in Downing Street.
But it will not give the full chapter and verse of everything that was going on behind the black door during lockdown.
Nor will it detail the worse incidences of rule-breaking in the building where people were setting rules at the same time.
Right now, No 10 might be hoping that this will at least - as far as Sue Gray is concerned - signal the end of the beginning.
I imagine the prime minister will apologise again, accept her findings in full and make some promises about trying to clean up the culture in Downing Street.
But while Westminster loves nothing more than intrigue about process, the point of this really is many members of the public may have already made up their mind about what happened, about Johnson's own involvement, and how how much this matters to them.
The breathless Westminster process-ology may preoccupy the postcode of SW1, but that overall big picture is what matters, not the dotted i's or crossed t's that may prove to be the least of Downing Street's worries.
Jessica Parker
BBC political correspondent
One of the most serious things that could come from the investigation would be if the prime minister was found to have misled the House of Commons.
As well as of course, people will want to know if he personally broke the rules.
Some of his defence has been: I thought I was at a work event, nobody told me - basically pleading ignorance saying he did not know. So how can you prove that? How can you prove what might have been in Boris Johnson's mind?
I think Sue Gray's not likely to be diving into the mind of Boris Johnson but reaching more factual based conclusions.
I think something to watch out for is whether there is any suggestion or evidence that he misled the House of Commons because that is, in parliamentary politics, a pretty serious event.
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