If you want postcode data to use then you might want to also look at NPE Map [1], as they have more data than FreeThePostcode At the time of writing, they have: # Total postcodes collected: 36295 # Prefixes collected: 2900 # Prefixes liberated: 97% # Sectors collected: 8398 # Sectors liberated: 88% Russ [1] http://www.npemap.org.uk/