Embattled Boris Johnson has started to replace the aides following a mass walkout amid the Downing Street Partygate scandal.
Downing Street 's woes reached new heights when it emerged Sue Gray was investigating 16 allegations of lockdown-breaking events, with 12 subject to a Metropolitan Police probe.
The top civil servant warned of "a serious failure to observe not just the high standards expected of those working at the heart of Government, but also of the standards expected of the entire British population at the time" in her interim report.
