My Lords, I sought to intervene earlier far more aggressively than I would ever normally do, simply because I wished to pursue the point made by my noble and learned friend Lord Mackay and the noble Lord, Lord Grocott, which was of considerable tactical importance in relation to this debate. There is widespread agreement that there should be parliamentary approval for the outcome of the negotiations. The Prime Minister herself has made it clear that she believes that should be so, and the noble Lord, Lord Pannick, has sought to incorporate that undertaking in the Bill. Again, I believe that that is the right thing to do.
The problem, however, is in the drafting of the amendment. In opening the debate, the noble Lord said he realised there were problems because it seemed to give a veto to the House of Lords—that would not be acceptable. Also, he said that it failed to recognise the relationship between the two Houses, whereby, at the end of the day, the House of Commons must be supreme. He suggested that we should agree to the amendment before us and then the House of Commons would sort it out. I think there is a very simple problem with that: people are less likely to vote for his amendment
on that basis than would otherwise be the case. Therefore, it may never get to the House of Commons and its Members will not be able to put the matter right.
As we now stand, we have a very difficult situation as to whether or not we should support the amendment. My inclination is still to do so, subject to what may be said subsequently, because it is important to have the undertaking in the Bill. However, we have to resolve the problem of ensuring that the House of Commons remains supreme. We cannot have a veto on what is being negotiated; it would be wholly inappropriate if the House of Commons took the opposite view.
One possible solution is to try to draft a manuscript amendment or to amend the Bill at some later stage in the proceedings. I fear that may be very difficult, although perhaps we might try. In any case, we should agree the amendment, but I understand that many people will feel it is defective in the respect I have mentioned. It would be very unfortunate if, as a result of these debates, we do not have anything to ensure that the undertaking given absolutely clearly by the Prime Minister is in the Bill and that there is no uncertainty about the situation in the future.