Re: A ploy to retake Scotland?
"This is a spectacularly expensive stunt just to wind Corbyn up. They must be more worried about him than anyone admits!
But what if it backfires and ends up making him look like a statesman? Aha, got it! This is aimed at Scotland. Antagonise them sufficiently and maybe enough of them will vote Corbyn to weaken the SNP!"
There have certainly been worse ideas by those trying to weaken the SNP, but that isn't saying much. Corbyn might have sound anti-nuclear-weapon principles, but the same can hardly be said of the parliamentary/union bits of Labour Party - any Scot who is thinking of using their vote primarily to get rid of nuclear weapons, and is vaguely familiar with Labour/SNP policies, will probably never choose Labour.
(Although, it's an open question as to what actually would improve Labour's fortunes in Scotland - it's not even clear that with 1 (out of 59) Westminster MP and 23 (out of 129) MSPs they've hit bottom yet.)