Hi,
Has the post_box been moved recently please?

The survey from 2010 shows the currently mapped location specifically:
https://www.openstreetmap.org/user/James%20Derrick/traces/692884

And comparison tools also show the mapped location as close:
https://osm.mathmos.net/postboxes/box-info/?ref=NE26+423

Thanks and Happy Mapping,

James