What Chris says is true... Bradup's a bit of a strange one to find. I'm not actually sure if I've ever found it myself... found something that could have been, but it was a bit of a jumble.
The 1928 reference is probably Arthur Raistrick. He has many of the Ilkley Moor sites down as appearing quite different to how they appear now. The grouse butts on the southern slopes of the moor have been a constant threat to the archaeology for a long time too and have eaten into a few of the sites.
I used to live in Leeds, down York Rd near Harehills/Chapeltown... near a very pleasant dual carriageway!