Hi Robert, We use a tool called Datum Pro to convert coordinates http://www.geomatix.net/datumpro/ as we receive data in a multitude of datum. Datum Pro has the following options for OSGB to WSG84: OSGB 1936 to WSG84 (Petroleum) OSGB 1936-1 to WSG84 OSGB 1936-2 to WSG84 OSGB 1936-3 to WSG84 OSGB 1936-4 to WSG84 OSGB 1936-5 to WSG84 If you don't have many coordinates, let me know what you need conveting and I can run it for you. Wendy
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