It is indeed install-date data, but this is actually pretty reliable (surprisingly) as: a) it's easy to filter out those which are obviously in the wrong area (i.e. if a box is on a UBR in Glasgow and the cabinet shows as in Bromley, then ignore it.
b) we're only interested in nice customers - boxes that move around by themselves are naughty customers (likely to be nicked/eBayed).
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that were never implemented from day one when it would of been a lot easier.
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It was half-implemented, in that data gets input at install, but it took brainpower to realise that you can use the install-time HFC data with the real-time UBR data to map things pretty well.