To answer Rob Gillespie’s question, the picture of the cursus in Cope’s book is taken from around SU018161 looking north-east. In the foreground on the right is a remnant of the SE cursus bank and across the valley the cursus can be seen disappearing into Salisbury Plantation (private land). Apparently there are traces of both banks in the plantation, as well as a long barrow built into the NW bank. The tree covered hill summit on the horizon is Penbury Knoll.
My own version of this pic is available here and I’ve posted a similar one on this website here.