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Boris Johnson has returned his questionnaire about allegations of Downing Street lockdown breaches to the Metropolitan Police, the BBC has been told.
The prime minister was one of more than 50 people to be sent the document by officers looking at potential Covid rule-breaking.
Mr Johnson received legal advice about his response.
He had until 22:00 GMT on Friday to answer the survey.
Mr Johnson 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 is investigating 12 events held across government and said a fine would be issued to anyone found to have breached Covid regulations.
A decision is not expected for weeks.