British postcodes with additional data optimised for geospace applications including easting, northing, latitude, longitude, postcode area, postcode district, postcode sector, outcode and incode. This API is provided by GetTheData.
Additional fields for geospace applications. Flexible input support: Postcodes are accepted in all the various formats which might be entered by your users. Input support for postcode areas, postcode districts, postcode sectors and unit postcodes.