Editorial: The Guardian

• Brexit isn't a one-off event, but an open-ended process.
• Changes to Northern Ireland's trading arrangements have been proposed to address DUP's objections.
• Foodstuff import controls from the EU to UK, postponed five times, began to be applied this week.
• Late import barriers will add more costs and complexities to supply chains.
• Separation from single market and customs union has severe and ongoing costs that were flatly denied by Brexit supporters.

Conclusion: Dodging the matter of realignment and reconciliation with the EU is unsustainable. The question of which parts of Brexit need to be undone will only get more urgent.

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