As my right hon. Friend knows, if the parties, using best endeavours, in complete sincerity with co-operation and good faith, are simply unable to agree anything, not even a few alternative arrangements or a partial agreement—the subsequent agreement referred to in the protocol can of course be a stand-alone agreement—the UK has no unilateral exit right to leave, unless there were a fundamental change of circumstance under article 62 of the Vienna convention on the law of treaties. My right hon Friend knows that, but the question is: is it likely? What this deal has now done is place the burden on the EU to negotiate those alternative arrangements, as a result of his work, in part. I say to him that he should trust in himself, trust in the British people and trust in our ability to deliver a good deal. We can use the new contexts in this agreement, and I believe we will secure a good deal for the Northern Irish border.