How to replace Britain’s PM

British Prime Minister Boris Johnson could face a leadership challenge if 15% of Conservative members of parliament (MPs) write letters demanding a confidence vote
  

Sir Graham Brady: Confidential letters are sent to chairman of 1922 Committee that represents Conservative backbench MPs in House of Commons

360 Conservative MPs	54
54 letters needed for confidence vote to be called

Confidence vote 
Johnson must secure backing of half of his MPs plus one – 181 votes

Johnson loses vote
Date for first round of leadership election chosen by Sir Graham. Johnson is barred from standing

Johnson wins vote
Prime minister remains leader. Gains immunity from another formal challenge for one year

Leadership contest
Candidates need support of two MPs
   
If only one candidate comes forward, he or she becomes new party leader

Multiple candidates: Conservative MPs vote. Candidate with lowest vote eliminated until two remain

Postal ballot of party members
     
Winner becomes party leader and prime minister


Sources: Reuters, UK Parliament 
Pictures: Getty Images 
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