I don't know but it will be a messy few days. I just can't see there being any good outcome for Starmer here, they pull rank and burn goodwill, even if they win the vote it gets kicked back and forth between the commons and the lords, and rightly so as it isn't a manifesto pledge.
I think they should pull it and have another go at putting together something more palatable to their own party but obviously its another episode of perceived incompetence. Unfortunately a lot of rebel MPs know that something needs to be done but don't have the stomach to do it, so I don't think that will get us anywhere. I think hyperbole has taken over already.
Never going to happen because it would be mental but if Starmer did want to throw his weight around, treating any loss as a loss of confidence in the government and committing to call a general election if he loses would get quite a few labour MPs feeling a bit twitchy.