Adopted as official definition of OSGB36 from August 2016. Accuracy by definition exact. Accuracy compared to triangulation coordinates 0.1m at 67% confidence level.
Replaces OSGB 1936 / British National Grid to ETRS89 (2) (code 1039). May be approximated to better than 0.03m using NTv2 method - see tfm code 7709.
Ordnance Survey National Transformation
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