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I have found out where they're from! I exported the crawl report and saw under the referring column where the links come from. It's in a directory which I haven't blocked in the robots.txt, it's in the process of being changed so hopefully when the website is next crawled it won't find these URLs in the first place.

The 4xx report had 0 errors, and then on the recent crawl it found over 200. They are all variations on real URLs e.g.:

Real URL:

http://www.bullseyeuk.com/10-up-deluxe-literature-holder.html

404 Error URL:

http://www.bullseyeuk.com/10-up-deluxe-literature-holder.html ��

None of them are linked to the root domain and I can't find where they are coming from.

Any ideas?

Thanks

Jack