I reread the page, which says the tag refers to officially used boundaries, which would not apply to N.I, since it is not the policy of OSM to have historic boundaries. However, if, as Stephen says they are still used for the official addresses of houses then they do have a use and I presume, effectively haven't changed since 1921 when the ward system was brought in. Does anyone know of any source or document which would clarify the matter? Is there some kind of N.I government body to ask.
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