The British government has been commendably muted on the behaviour of von der Leyen and other politicians.
If strict East-West checks and North-South checks are problematic, the only solution left standing is to minimise the former by rewriting the Protocol.
Macron has been steadfast in his belief that the EU should stand firm on access to UK waters. He may be forced to compromise, however.
Deals with the US, Japan, Australia and New Zealand will prepare the country for future EU-related bumps in the road.
Specific governance arrangements can be established in individual areas, and an agreement should sit outside the overarching institutional framework.
There are people in Brussels who will want to drive a proposal so that the institutions here can grab more power, gain more profile and seem more relevant.