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As far as I can tell, this isn't an issue with the specific database itself, but the standard they are required to record geographic data in, which the end of the article mentions as "BS 7666". https://www.agi.org.uk/wp-content/uploads/2020/11/BS7666Guid... # Standard data types used in BS 7666
CharacterString: a sequence of alphanumeric characters
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If I had to guess, alphanumeric is interpreted as [0-9a-z].The sign printer probably expects this format when printing signs for the government, or worse, has a contract that says the government must provide this standard format for the sign information. So it's just a government mandated database schema... I don't think that's any better of a reasoning though lol |
> How to use these standards > > The UPRN and USRN standards form a machine-readable addition to an address or street record held in a system. When using UPRNs and USRNs you can continue to use existing formats but add a field for these identifiers. https://www.gov.uk/government/publications/open-standards-fo...