woohoo!
treat for you, missus ...
there's a couple of barrows to the SW of the Observatory, and my sources tell me of a mound on Blackheath Common, the other side of the road.
Check out:
http://www.flamemag.dircon.co.uk/pagan_london.htm
I'm waiting for me "Prehistoric London" to arrive - I've ordered mine, but there's another here, and lots more too:
http://dogbert.abebooks.com/abe/BookDetails?bi=98602273
heh --- we *shall* reclaim the land
RG