The appointment comes after allegations Dame Antonia was previously spoken to about her management style
The appointment, which has been rumoured for weeks, comes after allegations Dame Antonia was previously spoken to about her management style.
She previously faced allegations of bullying relating to her time as consul general in New York in 2017, but was later cleared by the Cabinet Office following an inquiry.
Dame Antonia, currently the permanent secretary of the Home Office, is the first female cabinet secretary in the more than 100-year history of the role.
She succeeds Sir Chris Wormald, who became the latest member of the prime minister’s top team quit last week as Sir Keir seeks to overhaul his Downing Street operation following a string of scandals.