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The geoid error (the OSGR code used WGS84 instead of the correct Airy'36) is in MapPoint 2002, and was fixed in MapPoint 2004.
Also note that a six digit grid reference is only accurate to 100m - by definition. Eight digit will give you ten metres, and ten will give you 1 metre.
I think I tested MapPoint with 8 digit GRs from North Wales (because I have 1:10,000 OS maps of parts of Snowdonia), but it was a while ago.
Richard |