UK has one of the best postal code system in the world. This system was adopted nationally between 1960 - 1970 and then improved by Royal Mails which is the oldest postal service company in the UK. Each postcode(e.g. DH6 4SB) is consist of two parts, named as Outward Code (e.g. DH6) and the Inward Code (e.g. 4SB). The Outward Code and Inward Code are separated by a single space.