GeoGraph - photograph every grid square

There is nothing to attract the eye here on the bank near Ffynnon Bedr farm along the road between Letterston and Little Newcastle but the gurgle of water catches the ear: it appears to be the overgrown site, or supply, of the ancient holy well of St Peter (one of several in the vicinity). On examination there seems to be some sort of stone construction which is choked with weeds; the spring then travels under the road and emerges below but it was not possible to access that.