Ordnance Survey - UPRN Usage Terms

You may use the UPRN for personal, non-commercial use or for the internal administration and operation of your business, which does not permit using the UPRN for the purpose of creating or developing any product or service intended for sub-licensing, distribution or sale to third parties (notwithstanding that the UPRN themselves or any associated attribution or geometry that has been created with benefit of UPRN may not actually be supplied as part of such product or service). Therefore if you create any data which has benefited from, relied on or made use of the UPRN you are not permitted to sub-license, distribute or sell such data to third parties under the above terms.