The whole process of arbitration is a natural one in all trade arrangements between two different groups: they agree to an arbitration process when there are clashes of interpretation about what they have agreed. That is standard practice; it has been in pretty much every free trade arrangement. If we seek a free trade arrangement, the way to have that governed is through such an arbitration process, where differences-when things cannot be agreed between the two-are taken for a final process of examination and some kind of judgment about the matter. That would not be done by the Court of Justice sitting in the European Union, or by a UK court; it would be outwith both of those, but in the agreement. The point I am making is that if such an arrangement was agreed in a free trade arrangement, we would want to start it as soon as possible, because if there is an implementation period, we would want to start implementing what we have agreed as soon as possible. The hon. Lady needs to look up most of the other trade arrangements to see what I am saying. We want to give the greatest flexibility to the Government. It is crucial that as we leave, we leave the Court of Justice in that sense. I want now to deal with some of the arrangements in clause 6. I say to Ministers that there is a certain amount of confusion over where the courts are meant to reference the ECJ, including in respect of its previous judgments. As has been mentioned by some of my colleagues, including my right hon. and learned Friend the Member for Beaconsfield (Mr Grieve), there remains a confusion as to where the courts will reference judgments from the ECJ, both past and existing. I come back to the point of clause 6(2), where they are told not to have regard to anything. However, the Bill later goes on to modify that quite a lot. I am particularly concerned-this has been raised elsewhere-by the definition that“'retained EU case law' means any principles laid down by, and any decisions of, the European Court, as they have effect in EU law immediately before exit day and so far as theyâ€. The Bill goes on to reference exactly how that will work. My point is that those principles will themselves be modified by the European Court of Justice as it goes forward. My question really is: as they are modified, at what point will UK courts consider those principles to be no longer relevant to their judgments as they refer to them? I do not expect an answer right now, but I hope to get one as we go forward. Lord Neuberger has made the point that it is unclear to the courts how strong their reference should be-whether they should reference the principles or not. The point about the principles is the more powerful point, because I have no idea when the cut-off comes or whether it ever comes-whether we will ever break free, as it were, from continuing judgments and changes to the European Court principles.