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There is a JavaScript from Convert between Latitude/Longitude & OS National Grid References which converts between easting/northings to lon/lat, which could be helpful. It is also available in GitHub


I'd recommend using something like the proj4 library, which has wrappers in several languages, including JavaScript - Proj4JS. For C#, there's proj4net It has the advantage you can translate between all sorts of projections, not just OSGB. I'm not a great JS developer, but something like this should do the trick to convert OSGB back to WGS84 EDIT oops.. ...

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