The backstop is, indeed, an insurance policy, and we cannot put a time limit on it, because it would not be an insurance policy if it is not there when it is needed. We cannot allow one side to withdraw unilaterally. The tragedy that the backstop illustrates is that we are spending all this time on something that is necessary because the Prime Minister created the problem in the first place when she casually announced that we are leaving the single market and the customs union, probably not thinking through the consequences that have brought her to this point.
We have these debates every two weeks, but we are spending barely any time focusing on the real problem. As the Father of the House pointed out in his wonderfully eloquent speech, we have no idea what Brexit actually, finally, means, because the Government have refused to make the choices that confront them and have failed genuinely to reach out across the House.
Nothing illustrates that more clearly than the example of a customs union. In her heart, the Prime Minister knows that, if we want to keep an open border in Northern Ireland and if we want to keep friction-free trade, we will have to remain in a customs union with the European Union, yet she cannot bring herself to confirm that fact, not because it would be economically damaging—it would be quite the opposite—but because it would be politically damaging to the party she leads.