Factbox-If UK PM Boris Johnson is ousted, who could replace him?

Britain's Prime Minister Boris Johnson speaks during the National Service of Thanksgiving held at St Paul's Cathedral as part of celebrations marking the Platinum Jubilee of Britain's Queen Elizabeth, in London, Britain, June 3, 2022. REUTERS/Phil Noble/Pool

British Prime Minister Boris Johnson is facing a confidence vote on Monday following a series of scandals, including a damning official report about COVID-19 lockdown-breaking parties at his official residence.

Johnson has vowed to fight on as leader, but if he loses the confidence vote he will be out of a job, and a contest to replace him will begin.