Boris Johnson is expected to acknowledge "serious mistakes" in the 'partygate' scandal and has told allies he regrets lax enforcement of lockdown rules at Downing Street, according to reports.
The Prime Minister's leadership is hanging in the balance - with No 10 anxiously awaiting the final draft of top civil servant Sue Gray's report.
Mr Johnson has pledged to come to the Commons to make a statement on the Gray report, which is said to have been held up by legal checks after the Metropolitan Police announced a separate inquiry.
