Welcome to the Q&A Forum

So, essentially, you have snippets from various sources that all appear on one page? Unfortunately, no, there's no way to signify syndicated content from more than one source. Both the canonical tag and the syndication-source tag can only be used once, to the best of my knowledge. If you use it multiple times, Google will just ignore the additional tags. Just picking one source and cross-domain canonicalizing should solve the immediate risks and SEO issues, even if it isn't 100% correct. Syndication is a topic Google is really only beginning to handle well, and there are a lot of gray areas that the current solutions don't cover. The other option would be to just META NOINDEX those pages, but that depends on their value and the structure of the site. Whether you NOINDEX or canonicalize them, you're basically knocking them out of search results.

Hi Ryan, Thanks for response. Appreciated. Regards, Dave

Thanks for all the replies. Appreciated. I guess the reverse question: Do you think that having a lot of 'duplicate link no follows' on a webpage where there is already a 'primary link' is penalised. Again, your thoughts would be appreciated.