King's Cross Milestone

A stone at 345 Gray's Inn Road, London. Long thought to be an old milestone the Ordnance Survey map of 1868-73 (https://maps.nls.uk/view/102345964) shows it as a milestone marking 1 mile to Holborn. There is a short article on it here by Ian Visit: https://www.ianvisits.co.uk/blog/2019/03/28/find-the-kings-cross-milestone/ I hoped that photogrammetry might reveal some hard to discern inscription but none is visible to my eye unfortunately. 65 photos taken in June 2019 with a Sony a6000 and processed in Agisoft Metashape. Source: Objaverse 1.0 / Sketchfab