The issue was highlighted by the writer Ken Saro-Wiwa, who was executed in 1995 by Nigeria's military government, sparking international condemnation.
Mr Saro-Wiwa had led a successful campaign against Shell's activities in his homeland, even forcing the company to quit Ogoniland in 1993.
When a prominent writer and activist, Ken Saro-Wiwa, and eight others were hanged in 1995, western governments imposed limited sanctions and cold-shouldered Nigeria.
Mosop says the invitation was issued by the Wiwa family without the consent of the other families who would be affected by the decision.
Since the executed men were buried in a communal grave, any attempt to identify the body of Ken Saro-Wiwa will necessitate exhuming all nine bodies.
Noo is the daughter of the executed activist Ken Saro-Wiwa, and she makes an entertaining, thoughtful, often disappointed guide around a country she left as a child.
But Ken Wiwa, son of the writer, has insisted that all the families were consulted, and that the offer of exhumation by the PHR team was "warmly received".
Plans for the reburial of the executed Nigerian writer Ken Saro-Wiwa and his fellow activists have sparked a dispute between the Wiwa family and the organisation which he represented.
Local anger was most famously mobilised in the Ogoni area by opposition politician Ken Saro-Wiwa, but in all parts of the Delta protesters have blocked access roads, occupied production platforms and-on occasion-sabotaged pipelines.
The Movement for the Survival of the Ogoni People (Mosop) and the Wiwa family have exchanged a series of angry press releases, in a feud which appears to hinge on an invitation to foreign forensic experts to exhume the bodies.
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