Thanks Emma. I can only assume Rhiannon was off with her fairies that day as the MAGIC map doesn't seem to show any long barrows near Elkstone, and nothing at the original grid reference. I have renamed the site according to this http://magic.defra.gov.uk/rsm/31934.pdf
and your photos are now here http://www.themodernantiquarian.com/site/2002
if you want to add any further notes.
Thank you,
TMA Ed.
I think there might be a long barrow at/near Elkstone, but am at work and can't check. There are some stones in the churchyard I keep meaning to have a look at too (from DP Sullivan's Old Stones of Gloucestershire and the Forest of Dean).