The point that the Supreme Court made was that it had not tested the point about revocability. I say to the noble Lord, who knows what the outcome would be if it were asked to do that? The political position now is that the Supreme Court has not made that judgment, and it took going to the court to get the views that we have.
When we get to the end of this whole discussion, I wonder what the Minister will be able to say about our ability to trust the views of Ministers. I am not saying that we do not believe that Ministers really want to come back to Parliament, but the only assurance we will have is putting it in the Bill. The Government do not have good form over this. They foolishly went on to the Supreme Court after the High Court had told them what the judgment should be. We need this in the Bill because the Government have form for bypassing Parliament, and we need to know that that will not happen again.
We need the best legal checks and balances we can get—not to stop Brexit but to make sure that we obtain the best this country can get from it. That is why we need to vote for this amendment today. It is also why, if the amendment is successful in this House, I hope it goes on to be successful in another place. Britain relies on parliamentary sovereignty and now is the moment for it to be fully asserted by this House—not in six months’ time, not in 18 months’ time, not at the end of the period of negotiation. We have to make sure legally that Britain’s best interests are protected and safeguarded. That is the job of this Parliament. It is our job here today and I urge this House to vote for the amendment.