Published the reviewed four-nation United Kingdom administrative frame and retained separately dated reference families.

Current Admin spine: Selected the May 2026 Admin 0-3 boundary sources and their publisher-backed ward-to-local-authority relationship.
Reference history: Retained earlier 2021-2022 official boundary editions and the July 2026 OS Open Names community and settlement source as separately dated material.

Full and downloads: Bound the selected administrative and named-place routes to the Full, Display, and three downloadable tiers. The edition years do not assert a change date for every boundary.

Normalized geometry source and material ownership without changing admitted coverage.

source_material_identity: Added source-addressable family-bank and crosswalk lineage, licence policy, and material IDs.
version_owned_paths: Replaced prior version-owned Full, Display, and reference-partition paths with release-scoped successors while retaining admitted coverage.

Optimized family storage without changing geographic content.

physical layout: Repacked the admitted family Parquet into bounded query-optimized row groups; identities and geometry are unchanged.

Current-system baseline reconstructed from admitted release evidence.

release: Established the first unified release manifest without changing geometry bytes.

Established a reconstructed historical baseline from retained source evidence.

Established a reconstructed historical baseline from retained source evidence.

Unified the complete United Kingdom country release.

Closed the Admin0-3 spine and reviewed country families into the shared Full/Display/download workflow.

Organized canonical identifiers, licenses, aliases, and crosswalks.

Moved UK administrative identities and relationships into the shared canonical country-graph contract.

First United Kingdom administrative spine release.

Published the official relationship-backed Admin0-3 spine: 1 country, 4 Admin1, 374 Admin2, and 8,678 Admin3 records.