Let me return to that once I have set out the tests, because that is one issue that, with respect to the right hon. Gentleman—I do have much respect for him—the House ought to consider on the factual basis that is set before it. The first test is that departing from the treaty is the only means available to the state party
“to safeguard an essential interest against a grave and imminent peril”.
I quote from the case law and the text of the convention. Let us just break that down. On “an essential interest”, it might be that the Government could, at some point, make a case to say that the disruption in Northern Ireland, be it economic, societal or political, gets to a stage where it could threaten an essential interest of the UK. I concede that, but I have not, as yet, seen the evidence to justify that.