Postcode grid references are created and maintained by National Records of Scotland (NRS) for every live small user postcode to accompany the postcode unit boundaries.
Postcode grid references are used in point in polygon processes to allocate each postcode to a set of higher area geographies (e.g. Health Boards).
Grid references are published twice a year as part of the Scottish Postcode Directory (SPD) which should be considered the definitive source for postcode geographies in Scotland.
