What facts has Corbyn got now that he didn't have a few months ago and what's suddenly changed in the EU?
It seems to me that he has no confidence in his ability to be PM of a party who could introduce the sort of welfare and other protections (e.g. workplace) he ow claims are at risk if we get out of the EU. All that despite previously claiming the EU was bad for the working man for many, many years.
It's ironic that he'd place his trust in Eurocrats to now deliver the sort of change he says he wants rather than his own party. At least Labour can undo what the Tories do, they can't undo EU directives.