OpenStreetMap
This is a really helpful looking document for working with addresses
Air a phostadh le Govanus 14 An Gearran 2014 sa chànan Englishhttp://www.nlpg.org.uk/documents/LLPG_SNN_best_practice_v2.pdf
It covers UK numbering for flats and split use buildings and all the other special things that crop up.
It is used by parts of the goverment to do the same process that we do when adding addresses on OSM when they put them into thier databases.
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