Once this period expires, the UK will look to agree either a “highly streamlined” border with the EU, or a new “partnership” with no customs border at all.
This is the most optimistic reading of London’s proposal for “a temporary customs union.” introduced by David. It gives a pretty broad clue of what they’ll propose shortly for the Irish border. The customs proposal has met with circumspect replies from Brussels ans Dublin.
Something more meaty is bound to greet the publication of the border plan expected tomorrow.