I congratulate my right hon. and learned Friend on his work, and on the splendid candour of his statement and comments this morning. I also congratulate the Secretary of State for Exiting the European Union on getting alternative arrangements and an implementation date into the text. If, however, despite the very best endeavours in negotiations and the very best of faith, agreement is not reached in time for the end of December 2020, what can an independent, sovereign UK do? If a decision is made at the political level that the game is not worth the candle, can the UK walk away?