it was based on Lionel Sims' work:
http://www.uel.ac.uk/social-sciences/staff/anthropology/lionel.htm#
he's in the London School of Samba, who I noticed were credited at the end.
he does a class on "Decoding Stonehenge" and "Anthropology of Carnival"
"His one hour feature film 'Stonehenge Rediscovered' looks at how the elites of ancient man used Stonehenge to pretend that they had the right to rule. "
sounds alright to me ...
RG