I wonder how many have seen Jon Morris' website on http://heavenshenge.blogspot.co.uk/?
It strikes me it has relevance to the Megalithic Empire.
1) Tin from Cornwall was being mined at least 5000 years ago
2) Tin could be used for mirrors
3) Trad.Archeology struggles to explain why people from as far as Germany came to Stonehenge to live and die.
If we accept Jon Morris's view of Stonehenge as a geocentric solar university, maybe we should we think of Avebury as more than a communication hub? A planetarium as well perhaps?
But with long-distance trade established by the Megalithic Empire, so surely there would be long-distance communication and knowledge. Were the "angels" or messengers simply depicted with winged feet as a metaphor for being fast carriers of messages? Was there a megalithic version of David Coleman who would have said "He literally flew the last megalithic mile". Cue Catholic icons of angels with wings.