Conservative leadership challenge Sir Graham Brady Tory backbench chief has received letters from 48 Conservative MPs – 15% – calling for no-confidence vote in Prime Minister Theresa May No-confidence vote If 159 MPs vote against prime minister – 51% of ballot – May will be removed as leader of Conservative Party May loses vote Date for first round of leadership election chosen by Sir Graham. Incumbent is barred from standing May 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: Party members vote for preferred candidate. Winner elected party leader Source: House of Commons Library Pictures: Getty Images © GRAPHIC NEWS