How embarassing, thanks to an e-mail from John I just discovered that I have had the comments set to moderated on this blog all the time (I never checked). Thank you for all the comments, which have now been released, I must spend some time now to read them :). Also anybody can comment now.
Now I have comments I am spurred on even more! Dang I have been talking to myself all this time and not listening to what everyone else has to say (a bit like my early Mandarin Conversations). Having had a look it may take a little time to respond to some of the excellent points, it is terrific to have so much response it is all very valuable.