NIP Art 16 refers to “serious economic, societal or environmental difficulties that are liable to persist, or to diversion of trade,..” Does not specify international trade. Is akin to US “interstate commerce” wh is trade internal to US. In any case… (1of2)…
On the Northern Ireland protocol trade diversion point (assuming UK actually trying to make watertight argument), not clear to me UK can focus on GB->NI movements of goods at all. B’cos not international trade, rather movements within a country.