source-observations.csv: exact numeric cells from LT118_unrounded. source_row and source_column are 1-based; flags preserve official footnote/revision markers. dwellings is a count, not money.
england-change-decomposition.csv: old and new national counts, raw change, signed contribution to net supply change, and contribution divided by total change as percent. Demolitions have reversed contribution sign. Net additions row is the total, not another component to sum.
regional-non-new-build-balance.csv: latest national and regional new_build and net_additions; net_non_new_build_balance = net_additions - new_build; balance_share_of_net_additions_pct = 100 * balance / net_additions. England is a benchmark, not a tenth region.
validation-checks.csv: residuals for 33 accounting checks. All should be zero for this vintage.
findings.json: machine-readable summary. Published percentages are rounded from these values.
