I must press on now, and not take any further interventions for some time out of respect for others who wish to speak in this debate.
The Government now accept that they must come to the House and make their case. I think that they recognise that that case would have to be a persuasive one, and that the level of breach by the EU—which would have to be a breach of its obligation of good faith, which in turn would be a breach, it seems to me, of the obligations under article 26 of the Vienna convention to operate in good faith—would have to be made out before I and many others would be prepared to vote for such a course, because of the potential consequences for our international reputation and standing. That is why I am prepared to adopt the formulation of the Lord Chancellor that such a thing might be acceptable in extremis. This is not a carte blanche for the Government, and, in fairness, I do not think Ministers have ever taken it as such; I think they know that it weighs heavily to do such a thing. If the Government move amendment 66 at the relevant stage tomorrow, I will be prepared not to press my amendment, but it is to give the Government the chance to make their case as to why such an exceptional step should be necessary.
It is not wise or constructive to conflate the positions of domestic and international law in this debate; they operate in different spheres, and much of what we are looking at would be in relation to treaty law. A test that is not dissimilar—although it can never be exactly the same—to those considered in the Vienna convention is, therefore, not out of the way.
I welcome, too, the fact that the Minister indicated that the measures that would be initiated would include the arbitral provisions under the protocol to the withdrawal agreement. To try to oust those provisions would be a material breach of the agreement on our part, and would be unconscionable. Under certain circumstances the timeframe for that might not be capable of being resolved in such a way that we might not have to take some proportionate and temporary action ourselves to safeguard a vital interest, but I am sure the Minister and the House will note that I choose my words carefully in all those regards. This is not a green light to treating our international obligations lightly or cavalierly; it is an opportunity for the Government to justify why it
might be necessary. One cannot give undertakings as to what that might be until we have seen the evidence at the appropriate time, and I am sure the Government know that, too. But I hope that in practice this also has the desirable effect of enabling the negotiations to proceed and, at the end of the day—with good faith on both sides, which I hope, underneath, is still there—we can get an agreement with the European Union and leave on the terms of a deal. That may not be as good as I would have liked, but much of what I have been doing ever since the referendum is trying to mitigate a circumstance that I did not wish for but which I believe has to be addressed head-on for the sake of the country. If we can achieve an agreement, I hope these provisions will be otiose and we will see no more of them. The rest of the Bill is necessary because we need a proper and efficient working of our internal market once we leave the European Union. Therefore, my other motive for adopting the course that I have is not to obstruct the rest of the Bill needlessly.
It is in that spirit—which has, in fairness, been reflected in my exchanges with the Minister—that I set out the case for why the amendment is important to debate and to consider. If the Government are able to deliver in the terms that we have discussed, I will give them the chance to make their case, if it ever be necessary, in the profound hope that we never actually get to that.