All postcodes and their positions are under licence from the Royal Mail.
The database conatins approximately 1.8 million postcodes and is updated monthly with the latest information from the Royal Mail to ensure any new postcodes are added and ceased postcodes are removed.
All UK postcodes are included accurate to within 1 metre. Post codes for PO Box use are not included in this database (as these are not tied a specific geographical location).
The distance calculated is the direct distance (also known as "as the crow flies").
All data is supplied to you in accordance with the license.