Search HM Land Registry price-paid data. Provide either postcode or both street and city (case-insensitive; uppercased for the query). Optional filters: minPrice/maxPrice (GBP), propertyType (detached | semi-detached | terraced | flat | other), fromDate/toDate (YYYY-MM-DD), limit/offset (pagination), sortBy (date | price), sortOrder (asc | desc). Returns JSON: { properties: [{ price, date, postcode, propertyType, street, city, paon?, saon? }], total, offset, limit }, where paon is the Primary Addressable Object Name (e.g., house number/name) and saon is the Secondary Addressable Object Name (e.g., flat/unit/apartment).

Look up UK postcodes (Code-Point Open) and find nearest neighbours using OSGB36 eastings/northings. Provide either postcode or both easting and northing as the center. Optional: radiusMeters (meters), limit (default 10), includeSelf (default false), adminDistrict filter. Returns { center, postcodes: [{ postcode, easting, northing, positionalQuality, countryCode, adminDistrictCode, distanceMeters }], total }. Requires a local database built from the bundled codepo_gb CSVs via npm run build:postcodes.