In her internal investigative report on the "Partygate" affair, the top British official Sue Gray blamed the leaders in politics and administration for the misconduct surrounding parties at the seat of government in London during the corona lockdown.
"Many of these events should not have been allowed," said the report published on Wednesday.
The top management must take "responsibility for this culture".
British Prime Minister Boris Johnson had previously received the full investigation report.
"We can confirm that Sue Gray has made her final report available to the Prime Minister," said a spokesman for the central government agency, the Cabinet Office.
The top official Gray had been assigned by Johnson with the internal investigation.
Johnson was expected to comment on the report in Parliament around noon.
Multiple media outlets unanimously reported that senior government official Simon Case would neither step down nor be fired by Johnson.
Case is the Chief of Civil Service and is credited with being responsible for the tolerated culture of partying and drinking in Downing Street.
The report is eagerly awaited.
Gray had internally investigated several lockdown parties at government headquarters where corona rules were broken.
Because of police investigations, Gray had only published a greatly abridged report.
In it she accuses Downing Street of serious misconduct.
The London police have now issued more than 120 penalties against dozens of employees, and Johnson was also fined in one case.
The opposition and some MPs from Johnson's Conservative Party are calling for the prime minister to resign.
The 57-year-old politician has ruled this out so far.
Johnson also received support on Wednesday: This was not a key moment for the prime minister, Tory MP Charles Walker told the BBC.
On the contrary: Johnson has the worst behind him.