Another aide has reportedly left Number 10, taking the total number of departures in less than 24 hours to five.

Number Ten Policy Unit member Elena Narozanski is the latest aide to leave Boris Johnson’s Downing Street operation amid the continuing fallout from the partygate allegations, Conservative Home reports.

Her departure comes after Number 10 revealed Dan Rosenfield, the prime minister’s chief of staff, and Martin Reynolds, Mr Johnson’s principal private secretary, are leaving their roles.

Two other key advisers to Mr Johnson – press chief Jack Doyle and policy chief Munira Mirza – have also resigned.

Speaking to Sky News before Ms Narozanski’s resignation was revealed, energy minister Greg Hands claimed the departures were evidence of the PM “taking charge”.