Parliamentary Scrutiny of Leaving the EU

Is not the prerogative absolutely key here? In 1924, when there was a Labour Government, we insisted that all treaties would be laid before the House for 21 days, so that the House and the House of Lords could take a view on them. That was the Ponsonby rule. When there was a Conservative Government, they got rid of it. When there was a Labour Government again in 1929, we put it back, and in 2010, we put it on the statute book. Is it not really worrying that Ministers have been going to the House of Lords and this Chamber and relying solely on the prerogative in relation to treaties?