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School Census 2016-2017 Unique property reference number [ALL Schools] A unique property reference number (UPRN) is a unique alphanumeric identifier for every address in Great Britain and can be found in the ordnance survey (OS) AddressBase products. It provides a comprehensive, complete, consistent identifier throughout a property’s life cycle – from planning permission through to demolition. For the 2016 to 2017 school census, the UPRN will be added as a voluntary data item to be returned alongside the full address (in either BS7666 or address line structure). The collection of UPRN should be relatively ‘invisible’ to data providers with the burden managed by the way addresses are processed within school systems. Schools are not expected to collect, or look up, the UPRN and instead this would be automatically populated within your school system when entering addresses if the OS AddressBase database is used as a reference. For schools and / or systems not using AddressBase there will be no change and they will continue to use either BS7666 or Address Line formats for submitting addresses.