I remind my right hon. Friend that I voted remain in the referendum. I have voted in the House to deliver Brexit ever since. I congratulate him on the constructive proposals that he has put forward, and wish him every good fortune that the EU will engage with them as it needs to. I remind the House, and perhaps he could confirm, that existing trade across the border in Northern Ireland takes place with different currencies, and with different VAT rates, as he has just been elucidating, without the need for any physical infrastructure; and customs arrangements, following the excellent work done on the alternative arrangements commission, can do the same.