Supersedes the original spec's W2. The Search Console baseline inverted its
ordering: every measured location query is town or district level, none is an
administrative area, and phase is part of the query rather than a filter.
Two problems the original design did not anticipate. 67 viable towns share a
name with a local authority, and the authority is the larger set in only 43 of
them — postal towns cross authority boundaries, so neither can absorb the
other. Two namespaces resolve it by construction. And the GIAS town field
collapses 1,819 London schools into one value, which a curated
locality-to-outcode seed solves without new ingestion.
Sizing is measured against the live 25,185-school corpus rather than
estimated: 783 viable towns, 1,760 outcodes, 154 authorities.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015mWQnpye9F299NVRCCSRvj
