I made a note of the photo, and came back here to dig up what I could. I discovered this site.
An image from the site's page:-
From the site:-
Site Name: The Atropos Altar Stone Alternative Name: The Nemesis Stone, The Gresford Altar Stone
Country: Wales County: Wrexham Type: Sculptured Stone
Nearest Town: Gresford
Map Ref: SJ347550
Latitude: 53.088202N Longitude: 2.976449W