Specifically, the projection used is the Ordnance Survey National Grid projection, which is Transverse Mercator. The OS published a good introductory (but deta

Specifically, the projection used is the Ordnance Survey National Grid projection, which is Transverse Mercator. The OS published a good introductory (but detailed) guide some years ago: https://www.ordnancesurvey.co.uk/documents/resources/guide-coordinate-systems-great-britain.pdf https://www.ordnancesurvey.co.uk/documents/resources/guide-c...