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Thanks very much for the reply Miriam

This seems quite useful and accurate though I ideally need something which can accurately handle batch processing of multiple URLs so that I could analyse my client sites in one go rather than page by page.

I've discovered that one of the sites I am working on includes content which also appears on number of other sites.

I need to understand exactly how much of the content is duplicated so I can replace it with unique copy.

To do this I have tried using tools such as plagspotter.com and copyscape.com with mixed results, nothing so far is able to give me a reliable picture of exactly how much of my existing website content is duplicated on 3rd party sites.

Any advice welcome!