Peter Senior
Peter Senior is a trustee of Genesis Agendum. Confirmation of his academic position can be found at http://www.lboro.ac.uk/departments/el/staff/senior.html; incidentally, he only holds a BSc which may account for his name not being on the Estelle Morris letter. He made comments at this web page of the Royal Society:
http://www.royalsoc.ac.uk/discussion.asp?id=4299&pageno=3 which seem to suggest he is a YECer (it’s a regurgiquote comment).
There is mention of him in the creationist article at http://www.creationontheweb.com/content/view/1597 which claims he has a PhD.