British Prime Minister Boris Johnson announced he will resign, which means there will now be a leadership election to decide who becomes the next Conservative leader and prime minister.
They will have to secure the backing of Tory MPs, with the final two candidates going to a ballot of Conservative members.
But who are the potential candidates?
Remember, most of these MPs and ministers have not yet said whether they want the job of Tory leader and PM – but they are the ones to watch. Others may also come forward. [BBC]