Thanks for quick response. After I did the post I kept looking and stumbled upon the site you refer to. I tried a variety of things such as stoping and starting AMDS, re-installing iTunes etc. etc. Finally what I did was remove every vestige of Apple software, restarting the computer and re-installing iTunes. I was very pleased with the result as not only does it now see my iPod but my library is totally intact including playlists, so no re-building required.
The link that species these procedures is below.