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There is no constitutional convention that says the leader of a GNU
There's no convention for that at all. There is for who gets to step up to the plate in the case of a vote of no confidence overturning the incumbents. Support for a GNU would bolster the case for that person being able to form a government, not the other way round.
itsbruce-
There's no convention for that at all. There is for who gets to step up to the plate in the case of a vote of no confidence overturning the incumbents. Support for a GNU would bolster the case for that person being able to form a government, not the other way round.
Absolutely, the leader of the opposition gets first dibs, unless it's clear that he won't get the MPs, which he won't. What there certainly IS constitutional convention for is that majority rules, and he ain't got one. So if he were serious about stopping no deal, he wouldn't be faffing about putting his own name forward, he'd be supporting GNU by any means necessary.
I'm not sure I follow your second point.
ReekBlefs
Could you provide some evidence for this? There is no constitutional convention that says the leader of a GNU should be the leader of the opposition and plenty (particularly within the 20th century) to say that it usually isn't.