I will give way in a moment.
First, such a provision would bring legal certainty; secondly, there are operational reasons for it. I have met no one who really understands the operationalisation of the policy who does not believe such a provision is crucial. Those advisers have told me time and again that the scheme will be seriously impeded. People will put in claims and go to court. The upper tier tribunal, which is already under pressure, will be overwhelmed. Our detention capacity—just a few thousand spaces—will be full. In a single week in August, 2,000 beds in our detention facilities could be filled. Those arrivals will go on to our streets. They will abscond, as they always do, never to be seen again, and the scheme will be brought into quick disrepute. I do not want to see that happen. I will give way to the right hon. Lady.