Fixed-term Parliaments Bill

I recognise the strength of the Minister's arguments. The effect of the amendments, surely, would be to leave us with not a Fixed-term Parliaments Bill, but a Fixable-term Parliaments Bill. We could get into a constitutional ““fix”” in trying to ““fix”” the term, with an elected Chamber voting one way and an—in all likelihood—still unelected Chamber voting another way. If that happened, what would be the default position?