[Cronos]

There won’t be an internal EU customs check.

There will be an internal UK customs check between NI and the rest of the UK (RotUK)

Northern Ireland will remain judicially and politically part of the UK, but will follow EU trade rules and commercial standards/regulations.

[higgmeister]

Northern Ireland will remain judicially and politically part of the UK, but will follow EU trade rules and commercial standards/regulations.

And you appear to think that's good?   That's wrong!

[pierrem15]

Rather thorny issue of enforcement if British Customs is accused of deviating from EU norms: who decides compliance?

I don't want to make more of it than it is, but it's hard to underestimate the European penchant for fudging such issues.