JEREMY CORBYN could provide the political “antidote” to Labour’s “Blairite virus,” according to the leader of one union which announced its backing for his leadership campaign yesterday.

After winning the endorsement of Unison on Wednesday, Mr Corbyn was further boosted by nominations from postal workers’ union CWU and rail union TSSA.

It means the bookies’ favourite and poll frontrunner now commands the support of six affiliated unions — double that of closest rival Andy Burnham.