andysays
Love and solidarity
In a situation where the Tories are the largest party by seats? Yes. Formally, within the UK system, the existing PM carries on if there is a hung parliament, and it is up to them to resign if they cannot find a way to govern. Convention has it that the outgoing PM then recommends that the leader of the largest opposition party be invited to attempt to form a government.
https://www.parliament.uk/about/how/elections-and-voting/general/hung-parliament/
This being the UK, these are conventions rather than constitutional absolutes, but that is how it would go down. At no point would Farage be asked to attempt to form a government if the Tories had more seats than Reform. If the Tories are the largest party by seats, that means they will necessarily have increased their seat number from what it is now, quite probably by a significant number. This isn't a situation in which the Tories are collapsing - it's a situation in which they are somewhat recovering. So a tory leader goes to the King and suggests a government in which that tory leader is not the PM? No, I don't see the circumstances in which they would simultaneously a) be in a position to do that as leader of the largest party and b) be so weak as not to be able to propose themselves as PM.
Within this hypothetical scenario, it is still possible that Farage says Reform won't support a Tory-led coalition unless he's PM, but he is willing to put together his own coalition with himself as PM.
The constitutional conventions that you mention only really relate to the order in which party leaders are given the opportunity to form a government. Farage wouldn't be the first to be given chance, but if other options aren't successful, he may still get one in the end.
I don't think this will actually happen, but it won't be prevented by constitutional convention.