Boris Johnson has until 22:00 GMT on Friday to answer a questionnaire from the Metropolitan Police about his participation in No 10 parties when Covid restrictions were in force.
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The prime minister was one of more than 50 people sent the document by officers looking at potential lockdown breaches.
Lawyers have been advising Mr Johnson about his response.
The BBC understands Downing Street is not currently planning to confirm when the PM has submitted his survey.
Mr Johnson has previously said he did not believe he had broken any lockdown rules, but apologised "for the things we simply didn't get right".
The Met investigation into 12 events held across government was launched in late January, after an internal inquiry led by civil servant Sue Gray passed information to the force.
She did not publish her full report due to the police investigation, but in her initial findings, Ms Gray criticised "failures of leadership" in No 10.
The police said a fine would be issued to anyone found to have breached Covid regulations, though a decision is not expected for weeks.
In a letter sent on Thursday, Ms Gray said she would allow staff being questioned by police to view notes on the evidence they gave to her inquiry.
But the BBC understands those staff will only have access to notes on their interviews, so they cannot see what others have said about the gatherings.
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