Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Immigration policy openness — work visas, family reunification, asylum processing, border enforcement posture.
Political and policy fallout from the exposure (from late 2017 Guardian reporting) that members of the Windrush generation — Commonwealth citizens who arrived in the UK from the Caribbean 1948-1973 with legal right to remain — were being wrongly detained, denied services, and deported under the 'hostile environment' immigration regime established from 2012. Home Secretary Amber Rudd resigned 29 April 2018 after misleading Parliament on removal targets; Sajid Javid appointed; Windrush Compensation Scheme launched April 2019 (~£360m envelope, poor take-up); Wendy Williams Lessons Learned Review published March 2020 identifying institutional failures in the Home Office.
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.