How UK will choose a new prime minister ---------------------------------------- UK Prime Minister Theresa May is to step down as Conservative Party leader, triggering a contest that will elect a new prime minister ---------------------------------------- Process overseen by party’s 1922 Committee, formally known as Conservative Private Members’ Committee – parliamentary group of Tory backbench MPs in House of Commons ---------------------------------------- BALLOT OF LAWMAKERS Candidate must be nominated by at least two Conservative lawmakers (MPs) ---------------------------------------- Proposers 1 candidate ---------------------------------------- Proposers 2 candidates ---------------------------------------- Proposers 3 or more candidates ---------------------------------------- LEADER ELECTED Winner becomes leader of Conservative Party and prime minister of United Kingdom ---------------------------------------- MEMBERSHIP VOTE Postal ballot of wider Conservative Party membership ---------------------------------------- SECRET BALLOT OF MPS ---------------------------------------- Person with fewest votes eliminated (process repeated until two candidates remain) ---------------------------------------- Sources: Reuters, BBC, WA Picture: Associated Press © GRAPHIC NEWS