The two people responsible for this debacle are Keir Starmer who ignored convention and precedent to visit the Speaker to 'urge' him to accept his amendment, and had not the wit to anticipate the danger this would bring, and Lindsay Hoyle, who had not the courage to resist the 'urging' of his Leader, or the sense to listen and follow the advice of his Clerk of the Court.
Both deserve to lose their positions; Hoyle has lost all credibility in the House, and I do not believe Starmer faced a long tenure as Labour leader once the Election is past, whatever the result, even before this mess. It is those who are lined up in the shadows to replace him that are the main concern.