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OSGB Grid Reference to OSM Map

Full OSGB Grid Reference with two-letter prefix:

Numeric OSGB Grid Reference with selected prefix:

(Set default 10km square by bookmarking a page of the form /?defsq=OV)

Fully numeric OSGB Grid Reference (Easting and Northing; normally 12 digits):

To obtain a grid referrence for a feature / point on OSM, I would recommend this site.