Andy, the information you've given is really interesting and certainly gives food for thought, and thank you for taking the trouble to post it all.
Ladies and Gentlemen, the comments you have posted both before and since are equally interesting and I'm bookmarking this thread so I can come back to it again and again and try and get my head round it all!
Whether one agrees or not, I think thanks are due to Andy for such a detailed explanation of his assertion in the earlier thread