Much confusion now reigns in the shadow cabinet and with Labour MPs, as Corbyn says he (as PM) ......future fantasy land btw, would ' never, under any circumstances use nuclear weapons.' where is the discussion he espouses? Now he could never be PM, precisely because he has said that.
No government ( in the West) would ever want to use them, but if we don't have any, or say openly we would never use them ( which amounts to the same thing)that leaves our country open to threats ( nuclear in nature) from any aggresive country or group within a country who chooses to threaten us.
So he has just ruled himself out of any future as Prime Minister, not that he was exactly viable anyway.