"A man who is probably Chronotis reappears in EDA: Unnatural History as Professor Daniel Joyce."
One of the authors of Unnatural History specifically denies this in a Usenet post:
http://groups.google.co.uk/group/rec.arts.drwho/msg/c1d45b12d98e3bcd?hl=en&
195.93.21.103 22:00, April 23, 2010 (UTC)