Re: UK addresses - SantaMufasa, ChrisHunt - you're quite correct.
However, all UK addresses now have a UPRN (Unique Property Reference Number) - these aren't yet in wide use, though I suspect that will change fairly soon.
Official addresses are the responsibility of the councils, the Royal Mail simply provide the postcode (though the two often have "differences" of opinion regarding the address on older properties.)
UPRNs are issued by Local Councils and are administered through a National Hub - this controls the UK National Land and Property Gazetteer (NLPG) which is made up of the various councils' Local Land and Property Gazetteers (LLPGs)
If addresses are formatted to BS7666 standard you can differentiate between:
3, Main Street, Barton In the Beans, NUNEATON, CV13 0DJ
3, Deacon Rise, Main Street, Barton In the Beans, NUNEATON, CV13 0DJ
In the first case, 3 would appear in the PAON (Primary Addressable Object Number). In the second case it would be in the SAON (Secondary Addressable Object Number).
(Is it a dead giveaway if I admit to being LLPG Custodian for a local council?
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Rosie
"Don't try to improve one thing by 100%, try to improve 100 things by 1%