You might think postcodes are simple but they are not. So many people use out of date or obsolete postcodes without knowing it. At UKCrimeStats, salve we have not just the standard 1.7 million live postcodes, but 700,000 obsolete ones too. We have also just added an additional 70,000 new postcodes that have been released. Keeping postcodes up to date is a work in progress and we work at it all the time.