My Lords, I will not detain the House for long. I think that there is pretty strong support all around the House for this amendment. It certainly has the support of the Opposition, who will vote for the proposition in the name of the noble Lord, Lord Turnbull, if he chooses to test the opinion of the House. What is needed in any “in or out” choice is an authoritative assessment of Britain’s intended relationship with the European Union should the people decide to withdraw from it. That does not have to be just a wish list of hoping that we can have our cake and eat it outside the Union. It has to be a hard, realistic assessment.
I am a great lover of history. I like reading books about Britain’s post-war relationship with the European Union. The Macmillan Diaries is one of the books I have read. Harold Macmillan tried to establish a free trade relationship with the Common Market when the treaty of Rome was signed. He explored that and failed because, even in 1958, he was not able to achieve what was necessary for the national interest, and he decided we had no alternative but to join the Common Market. So we have to be realistic and this assessment has to be realistic.
Many Members on our side of the House have pointed out that the proposed referendum is not a popularity poll, it is a fundamental choice. It is not a choice you take once every five or 10 years. You cannot say that it would be a choice made for ever but you can certainly say that it would be made for generations. It is important that this choice is taken not on the basis of wish lists or hypothetical speculations—as I think the noble Lord, Lord Davies, said—but on the basis of what is a realistic alternative. The truth is that those who want to take us out of the European Union rarely state what they think the alternative is for Britain, which is why this amendment is crucial. There is a huge range of possibilities. At one end of the spectrum, there is membership of the European Economic Area, probably as a consequence of rejoining EFTA; but at the other end, we would have to rely on our WTO status in terms of our trading relationship with the European Union.