I'm afraid I don't know,but I was going to mention this anyway:

It's not about Stonehenge, but you (and others) might like Aubrey Manning's 'Landscape Mysteries' series which is being repeated starting next tuesday (19th)
http://www.open2.net/landscapemysteries/tv_summaries.html

and then when I looked further at the site I spotted you can hear a podcast and watch some clips from a timewatch programme about Stonehenge (though as I recall this programme was pretty appalling in the way it leapt about making grand inferences about Healing)
http://www.open2.net/timewatch/2008/stonehenge.html

I think National Geographic seem to have done a documentary too. (er I haven't seen that either.._)