Let me just finish my point. I will give way in a minute.
I heard all the stuff when the Clerks were invoked—the advice of the Clerks to the Government to resist this approach. Of course it is true that the law can only be changed by legislation. That is a perfectly straightforward legal point. But in our constitution, in my opinion, the Government are accountable politically to the non-legislative votes of Parliament. It is utterly absurd to say that Opposition Supply days and amendments to motions of the kind we are addressing today are just the resolutions of a debating society that have no effect upon the conduct of daily government. If we concede that point in the middle of this shambles of Brexit, with all the other things we have to resolve, we will have done great harm to future generations because it is difficult to see how the concept of parliamentary sovereignty will survive such an extraordinary definition.