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Oops, I forgot to finish a phrase...
I just checked a place where I had spotted a Bing offset before and that disappeared. National aerial photos 2009 and 2012 are offset by 2.8m. Bing is almost in the middle. But that's because of a perspective effect. The national orthos have house walls slanted by about 1.4 m for the house height and 2009 and 2012 are slanted in opposite directions. The roofs are offset but they are at the same position at ground level. That's of course very tricky to compensate if one maps house based on roof contours. Cheers
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