I've had a play with the search facility and it looks like using a grid ref and restricting the area to 100 or 500 metres is the way to go to limit the number of results. It's a pity that with so much information the pages for individual panels don't have photos or plans linked to them and of course the link to the original BA entry takes you back to the broken website.
I'd love a copy of the kml file if possible, email is chriscollyer at stone-circles dot org dot uk
cheers-
Chris