The noble Lord is quite right that that is a very important point. It was raised at Second Reading that the Government felt strongly, and I understand why, that the royal prerogative should not be subject to at least inadvertent erosion. Of course it has been eroded in certain respects over the years; we do not need to go into what they are but they include treaty making and waging war.
I take from the noble Lord’s point this observation: one great benefit of the amendment proposed by the noble and learned Lord, Lord Judge, and the noble Lord, Lord Pannick, is that it makes clear that the royal prerogative is being maintained. I want to avoid seeing that apparently contradicted by other provisions in the Bill.
I have one other observation to make. I said a few moments ago that there were certain things that could happen: the European Council might accept the proposal or it might come up with another one. However, there is a risk that there might be no agreement at all; that needs to be considered. We have had discussions with the Government. I look to the noble and learned Lord, Lord Callanan—I am sorry, the noble Lord. He should be noble and learned as he has had to deal with so much of this Bill already; we will see if we can arrange that. I anticipate that he will give an assurance that, in the event that there is no agreement, the matter will be brought to the other place as soon as possible. Indeed, we expect it to be brought there this week, otherwise it might simply be too late.
When the noble Lord comes to respond on this amendment, I look forward to hearing what he says about that, and I hope he will give us sufficient assurance that if there is in fact a failure to agree at the European Council meeting then the matter will come back to the other place, which will therefore be able to debate what should happen next. It should do so on an amendable Motion so that it can put forward and support its view on what should take place. I do not know whether it would be for the convenience of the House if the noble Lord could tell us now what he will be able to say but, if not, I look forward to hearing what he says when he comes to respond to the debate.