Postcode → Region: postcodes.io (ITL/NUTS region + outcode).
- Rents: ONS Private rent and house prices, UK (latest release). London and nation figures used directly; English ITL1 regions use ONS PRS tables when available, else provisional scaling (clearly flagged).
- Energy/utilities: If your region profile includes unit rates + standing charges, we compute a monthly bill using TDCV (medium use). Otherwise, we apply a utilities multiplier.
- Food & transport: ONS Family spending in the UK regional patterns used for multipliers when supplied.
This prototype updates automatically when you replace /data/itl_regions.json with a sourced version.