[Brian Griffin]

The UK government promised NI that goods could flow freely from NI to Scotland, Wales and England.

The withdrawal agreement is inherently subject to this solemn promise of the UK to NI.

What about the concept of a United Kingdom could be beyond EU understanding?

The EU may have a case with respect to state aid.

[hanamizu]

The UK government promised NI that goods could flow freely from NI to Scotland, Wales and England.

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That becomes a problem if Ireland (EU) goods (and people) can flow freely into NI and thus to the rest of the UK and vice versa. To keep that from happening a border between NI and the Republic has to be real—at least that’s how I understand the problem.