baza wrote:
I fear it will remain covered, just as Notgrove (in the same county) has.
I visited nearby Nympsfield a couple of months ago, there were various bits of loose stonework lying on the grass there:http://www.themodernantiquarian.com/site/2239/notgrove.html
Notgrove was covered over simply because it was a popular long barrow and someone worried that visitors would damage it.
http://www.themodernantiquarian.com/site/602/nympsfield_long_barrow.html
Pics posted here. It's a shame, but limestone is so much more fragile than, say, granite. Cornish sites can stand exposed for centuries without any damage, but these limestone-constructed long barrow chambers are less permanent once they're out in the elements.