I presume not.
The very large voids that have developed at the centre don't seem to have been known about. The tomography results weren't exactly ideal...
"In the sections of the mound where good quality crosshole data were recorded, the frequency content was high enough to provide image resolution of approximately 2 metres. However, the major short-coming and disappointment of the survey was the quality of the crosshole data above the water table, due to extremely poor coupling between the hydrophones and the chalk hill."
Plenty of scope for missing a body or twenty there.