"No 10 was pushing for a second shot at a meaningful vote on Monday, but Mr Bercow told the Commons he would not allow it, and had come to that decision on the basis of a parliamentary convention dating back to 1604. He cited Parliament's rulebook, Erskine May, which says a motion that is the same "in substance" as a previous one cannot be brought back during the course of a single parliamentary session. The Speaker also said the circumstances around the motion had not changed, so his ruling was "necessary... to ensure the sensible use of the House's time and proper respect for the decisions that it takes": Brexit: MPs' vote on deal ruled out by Speaker John Bercow, BBC news, 21 ottobre 2019.
