Garth wrote:How does the process work, do they only get one shot at backing someone as caretaker PM or could multiple people be considered and voted on?
Under the FTPA, a vote of no confidence can be called, after which there are 14 days where either Boris Johnson or anyone else can attempt to form a new government. That government will then need to be approved by a majority, which by necessity includes the Tory rebels. If no government is formed, then a general election must take place.
A prime minister being chosen this way gets all of the powers that a prime minister would have, and there's no obligation to honour any promises to be "time-limited", or to "only" ask for an Article 50 extension. This, in particular, is stopping the Tory rebels in particular from falling behind Corbyn.