Unison leaders' backing for London MP Jeremy Corbyn
Jeremy Corbyn has received another boost in his bid to become Labour leader after receiving the backing of one of the country's biggest trade unions.
Unison leaders decided to nominate the London MP, with Yvette Cooper as its second choice.
Ms Cooper and fellow leadership hopeful Andy Burnham have warned party members they risk consigning Labour to years in opposition if they choose left-winger Mr Corbyn. The warnings came after reports of a private poll giving Mr Corbyn a lead of more than 20 points over Ms Cooper on first preference.
However, Mr Burnham's campaign has released its own poll, which gives their candidate a lead of almost 10 points.