Hi Ken
Bradup appears on the Explorer 27 map as 'Remains of Stone Circle' and on the magic.gov.uk map as the same but I don't know if that refers to the single standing stone that used to be there until recently or the pile of boulders.
As for Rivock Edge, have you been up there? I had a quick look once but didn't venture into the woods due to warnings of dire consequences for any trespassers on the main track. It looks like the footpath skirts through the western edge of the trees though so a slight 'detour' looks possible ;-)
-Chris