Hi Kane,
the sitemap is new - it's just that Magento create lots of duplicate files on the fly & it's not putting the canonical URLs in the sitemap etc.
I just wondered whether its worth hand creating a sitemap.xml containing the content pages (60 or 70 of them) for this relatively small site, or not worry too much about the sitemap, the site is pretty well indexed by google already
I'll head over to the Magento forums again to see if I can find more info
many thanks for you help