I think I found what I am looking for and really wasn't trying to be lazy in asking first without looking. Now I just need to get my head around the 'recommendations' given by google such as using mpn, isbn, upc and brand attributes because as things stand right here and now - this may as well be in chinese.

Anyhow I see where I need to make a few alterations in admin but still wonder why it has taken until today after many weeks of uploading without errors, for the feed to suddenly fail. Could it be that google has changed something?

Cheers

Rob