.co.uk and com: Independent sites, but owned buy us , sharing some product information

[BruceA]

We have two sites .com and .co.uk. Both are selling sites and the .com sells in $ and .co.uk in £s.
75% of the text is from the .co.uk site and used on the .com site.

Each site has 6000+ pages, 4000+ contain product descriptions that are identical.

We have looked at canonical and hreflang, but neither seem to fix the problem of duplication issues. We can add into the product detail master page rel alternative, but this will not fix the other potential clashes on the other pages.

Can anyone advise if we can add a site wide html to each site or one that will fix this.

Many thanks

[FedeEinhorn]

The way to solve this is actually using both Canonical and hreflang tags in all the pages that have duplicates. I remember answering a similar question that I am sure you will find it useful here: http://moz.com/community/q/custom-hreflang-tags-in-wp-using-with-yoast