Factbox - Who might be Britain's next prime minister if May goes?

MPs in British Prime Minister Theresa May's Conservative Party on Wednesday triggered a confidence vote in her leadership over Britain's planned divorce from the European Union.May has vowed to fight on as leader, but if she loses the confidence vote later on Wednesday she will be out of a job, and a contest to replace her will begin.The former foreign minister is May's most outspoken critic over Brexit.