Not causewayed enclosures, but immediately brings to mind the racks at Windover Hill, on here as a cursus. Also the weird bank barrow / track next to Pen Hill long barrow.

http://www.themodernantiquarian.com/site/3944 is the windover one.
http://www.themodernantiquarian.com/site/5696 is Pen Hill. I've been back to this 3 or 4 times now and I'm starting to come round to the opinion that this could be an errant Bank Barrow.