Tried that but obvously that has yet to work! In practice I'm not so much interested in showing him what the problems is (he is far beyond help) however I am interested in showing the less scientifically literate members just what a bunch of tommy rot this guy is talking!
Thanks for the Wiki link thedarkshade I'll stick that in the melting pot at our end. Do you know of any other links one could add to continue the
Regards
Chris
Excellent that one goes in as well!
Edit
Actually the Talk Origins link does not refute the specific BS proposed by our little visitor. His request is that we prove that c has not changed. If I am reading it right the TO link cites research that does not show this. The stated experimental data only says that a constant speed could fall within the experimental data. I understand this but our little creotard friend will just use it as a wriggle hole.