Description: While Royal Mail (RM) allocate and maintain postcodes for the purposes of delivering mail, National Records of Scotland (NRS) create and maintain digital postcode geographies to support the production of high quality statistics. This dataset provides the digital boundaries of postcode sectors which are the next hierarchical level above the individual postcode, represented by the outward code plus the first character of the inward code. For example, if the individual postcode is EH12 7TB, then the sector of that postcode is EH12 7. NRS publish these boundaries twice a year as part of the Scottish Postcode Directory (SPD) which should be considered the definitive source for postcode geographies in Scotland.