b. Will GB do the honourable thing and legitimise his position by calling a general election, thereby obtaining the mandate of the people?
Ha ha, ha ha ha ha haaaa.
Why would he want to do that?
He knows Labour will lose to the Tories at the next general election so it'd be better for a future Labour opposition that he mess the country up as much as possible so that the incoming Tory government is left with the problems to sort out making them look bad*, as happened the last time Tories replaced Labour.
* Such as having to pay off (through higher taxes) 10 years of not seen since WW2 levels of borrowing under Labour, with no gold reserve to fall back on as that was sold off as well.