Thanks for that - I think what we saw may have been the upper reaches of the disused quarry you can see on the map downhill from the moor. It's a nice pile of stones all the same but I'll take the picture off...
I should be back up there later in the week (weather permitting) so I'll see what I can find. While on the subject, can you give me some instructions on finding the carved stone on Ladybower Tor? I must have been up there five or six times but I've never noticed it, and as it's just over the road from Hordron Edge I thought I'd have a look.