In fairness, the right hon. Gentleman is absolutely right, and it is perfectly legitimate to shine a light on the issue of the backstop, which causes a lot of us concern, but can he help me to understand something? Under his proposal, if the United Kingdom were to remain in a customs union, would there not still need to be a backstop in any event, because we would be outside the single market? Is there not a concern that it does not really solve the issue? I ask that respectfully and in a spirit of inquiry.