* MPs have two hours until 8pm to cast their votes for or against Mr Johnson, with the result declared at 9pm.
* The PM's allies have insisted he will 'fight his corner' amid warnings that an early general election is possible
* Backbench chief Sir Graham Brady calls a full vote when he receives 54 letters from MPs asking for one
Tory MPs have begun voting on whether to keep Boris Johnson as party leader and Prime Minister after he warned them not to give Labour the keys to power by unseating him.
A queue of politicians waited to cast their ballots this evening after a day of high drama in Westminster saw backbench chief Graham Brady confirm that the PM''s political enemies had reached the critical threshold for a referendum on his time in office.
Mr Johnson addressed his mutinous troops this afternoon and told them successful 'fratricide' would gift Keir Starmer and his party an election win.
Read more ....
Update #1: Live: Tory MPs voting now on prime minister's future (BBC News)
Update #2: Boris Johnson no-confidence vote under way as Tory MPs cast ballots to decide prime minister’s future – live (The Guardian)
Update #3: British Prime Minister Johnson to face no-confidence vote (AP)
WNU Editor: This could be nothing. It could also be the end of Boris Johnson as Prime minister. The result will be known in the coming hours. My prediction is that Boris Johnson will receive enough support to continue as Prime Minister even though 54 Tory MPs indicated this morning that they wanted this vote. But this will be a hollow victory. He will be politically damaged, and his days as Prime Minister are numbered.