Picking a couple of paragraphs from Maeve Kennedy's article on the front page, and which she has got somewhat wrong, must have missed Silbury on the journey down ......
"Famously – to its comparatively few devotees and visitors, that is – it is the biggest henge in Britain that isn't there, surrounding one of the biggest artificial hills in Britain, which isn't there either"
"and the wholly unexpected discovery – the second, smaller henge so close to the modern houses that the roots of two trees at the foot of a back garden are actually growing into its bank."
There we are two-a penny henges, all over the place, swept clean and tidied up before they move on.
http://www.themodernantiquarian.com/post/89170/news/marden_henge_and_hatfield_barrow.html