Its interesting to look back at my notes from years past on the ground, staring in a state of confusion at the earthworks. Turns out this hill was a massive neolithic complex. 2 definite, 1 probable and 1 maybe causewayed enclosures (1 central, then 1 on each spur) plus 3 causewayed cross banks sepearating the spurs from the central enclousre. Plus 2 long barrows. Then they abandoned it and headed North-West to build a gert large cursus.
Have a look at the link I’ve added for (many) further details.