This file contains the National Statistics Address Lookup
(NSAL) for Great Britain as at March 2017. The NSAL relates the Unique Property
Reference Number (UPRN) for each GB address from AddressBase® Epoch 46 to a range of current statutory
administrative, electoral, health and other statistical geographies via
'best-fit' allocation from 2011 Census output areas (National Parks and
Workplace Zones are exempt from 'best-fit' and use 'exact-fit' allocations).
The NSAL is produced by ONS Geography, who provide geographic support to the
Office for National Statistics (ONS) and geographic services used by other
organisations. The NSAL is issued every 12 weeks and is designed to complement
the Ordnance Survey AddressBase® product. For further technical information
about this file, please refer to the 'Product Specification' document contained
within the downloadable zip file. Please note that this product contains Royal
Mail, Gridlink, Ordnance Survey and ONS Intellectual Property Rights. (File Size
– 372 MB)