eurostat_city_labels: API returns compact dimension JSON (category.label dict),
not SDMX 2.1 nested codelists structure. Fixed parser to read from
data["category"]["label"]. 1771 city codes fetched successfully.
ons_uk: observations endpoint (TS007A) is 404. Switched to CSV download via
/datasets/mid-year-pop-est/editions/mid-2022-england-wales — fetches ~68MB CSV,
filters to sex='all' + target year, aggregates population per LAD. 316 LADs ≥50K.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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