Boris Johnson will allow a second Sue Gray report into allegations of lockdown parties at Downing Street to be published - amid anger over a partial version put out on Monday.
Downing Street has committed to publishing another "update" once Scotland Yard finishes a police investigation.
It comes after the The Prime Minister first batted away widespread calls, including from senior Tories, to allow the senior civil servant to produce her complete work after the Metropolitan Police imposed wide-reaching restrictions.
In her report today, Sue Gray warned she has “extensive substantive factual information” on No10 parties, the Mirror reports.
It comes after interviews with more than 70 people and checking e-mails, WhatsApps, texts, photographs, official records and entry and exit logs.
Police revealed Ms Gray had gathered, and given to them, "well over 500 pieces of paper, about a ream and a half, and over 300 photographs".
But the report was stripped of almost all details after the Met Police asked Ms Gray to make only "minimal reference" to the 12 gatherings it was probing.
In a statement, a No 10 spokesperson said: “Given the police have said they are investigating a number of events, it would not be appropriate to comment further while the Met’s investigation is ongoing.
“But, at the end of the process, the Prime Minister will ask Sue Gray to update her work in light of what is found.
“He will publish that update.”
Labour leader Sir Keir Starmer was joined by Tory MPs in calling for the full report to be published.
Before the apparent U-turn, the Prime Minister’s official spokesman told journalists: “He will consider what is appropriate, obviously at the start of this he was the one that commissioned this report.”
Scotland Yard was clear that its order for limits on publication only covers the events it is investigating, and for the duration of their work.
A statement from the force said: “As part of the investigation it is necessary for us to contact those who attended these events to get their account.
“As a result, the Met has requested that any information identified as part of the Cabinet Office investigation about these events, is not disclosed in detail.
“This request only applies for the duration of our investigation and does not apply to events we are not investigating.."
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