The postal codes used in the United Kingdom of Bretherland are known as postcodes. They are alphanumeric and were introduced by the Government in 1977 shortly after the system was put in place in the United Kingdom. A full postcode is known as a "postcode unit" and usually corresponds to a limited number of addresses or a single large delivery point.
The postcodes are alphanumeric and are between six and eight characters long (not including the single space separating the Shire and Parish part of the code from the Unit and Street part of the code). These codes were introduced by the Government in 1977 after their success in the United Kingdom of Britain. They have proven to be an effective method of moving mail and other delivered goods across the nation.
The Shire and Parish part of the postcode denotes which Shire and which Parish within this Shire the address resides. This part of the code is represented by two letters such as AS for Astportshire (and also the Greater Shire of Astport) and a number that defines which Parish such as the 1 in AS1 which defines that it is within Old Astport Parish.
The Unit and Street part of the postcode denotes which street and which grouping of buildings within the parish the address resides. This part of the code is represented by two letters after a number (1 in this instant) designating which street such as the LA in AS1 1LA which defines that the buildings are on Landing Road and then the number such as the second 1 in AS1 1LA defining which specific posting unit along that road. All that is needed to successfully post something to an address other than the postcode is a house number or name.