THANK YOU, Ronald Hutton, for finally clearing up for me exactly what a fucking 'henge' was, before we applied it to Stonehenge (from "Pagan Britain", 2013)
Fwiw, a "henge" nowadays is an archeological term describing a Neolithic earthwork, of two nested rings, the outer of raised earth and the inner a ditch. The name obviously comes from Stonehenge.
Under this description, Stonehenge is not a henge.
@anandamide There was a henge found just up the road from me, in Northamptonshire. It caused a bit of local excitement and confusion, and then disappointment when a) it was clarified what a henge really is and b) we were told it's likely all been ploughed out, and therefore flattened.
Woodhenge is just up the road from Stonehenge, and in our family we know it as Concretehenge because of the markers that had been erected over post-holes that had been found there.