Trade policy openness — tariffs, non-tariff barriers, FTAs, industrial protection.
Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Announced 27 February 2023 by Prime Minister Sunak and Commission President von der Leyen, the Windsor Framework amended the Northern Ireland Protocol: created green/red lane customs channels at GB-NI ports (green lane for goods staying in NI), addressed VAT and excise differentials, Stormont Brake giving NI Assembly mechanism to object to new EU single-market rules applying in NI, and resolved medicines-regulation divergence. Largely ended the 2021-2023 institutional stand-off on NI Protocol and restored routine UK-EU working, though DUP remained outside the Executive until January 2024.
Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.
Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".
Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.