I can't believe I waded through this entire thread.
There is a lot of scientific ignorance being bandied about by both sides, something that I attribute to poor education more then anything. I don't know about UK or anywhere else, but American education, especially in the sciences, is hardly more then minimal. Most anti-evolution translates into anti-science and anti-education more then anything else, but I digress.
What I did want to say is that there is an excellent book that adresses the evolution of the eye. I bring it up because there were a lot of circular arguements going on about. If you are interested in checking it out, look for In the Blink of an Eye. Forgot the aurthor, but you can find it on one of the online bookstores. He did a pretty good job, though I think he downplays the other senses too much. Might want to take a gander if you are really interested in answering the question "How did complex organs evolve?"