General   (General discussion, talk about anything.)

Thanks, Joseph and Broady - I had a vague notion it was some kind of water level mark.

'The Bench Mark Database holds information and recent photographs of Ordnance Survey bench marks in Britain. Milestones and other wayside markers were often used as secure and stable locations for survey marks and there is cross referencing between items held in the Bench Mark database and the Milestone Society database.'

www.bench-marks.org.uk/