I am afraid that it is the noble Lord who misunderstands the position. I am not disputing the role of Parliament in ratifying an agreement. That is perfectly proper, but that is different from Parliament refusing the ability of the Government to terminate the negotiations. That is what intrudes Parliament into the negotiations and that is why, in my view, the amendment is constitutionally improper.
The amendment is also unnecessary, for one very simple reason. If at the end of the negotiations—I devoutly hope that this will not occur; I do not believe that it will occur; I do not think that there is much chance of it occurring—the Government find themselves completely at odds with Parliament, in particular with the other place, it is always open to the other place to pass a Motion of no confidence in the Government. Clearly, that would bring matters to a head and perhaps achieve the result that the noble Lord, Lord Pannick, seeks to achieve. Parliament is always supreme in that respect. Parliament can always pass a vote of no confidence in Her Majesty’s Government.