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Thanks, so it's not something I should be concerned about.

Thanks everyone for the quick replies, I already have canonical tag, like this page

The errors I'm getting are showing in the seomoz crawls

http://www.scalemodelshop.co.uk/1-35-german-camo-disc-ak-interactive-ak-157/reviews/category/ak-interactive#review-form

Page shows this in it

<link rel="<a class="attribute-value">canonical</a>" href="http://www.scalemodelshop.co.uk/1-35-german-camo-disc-ak-interactive-ak-157.html" /> 

I've just ran a report and I have a lot of duplicate page titles, most of which seem to be the review page, I use Magento and my normal url would be something like

blah-blahtext.html but the review url is something like

blah-blahtext/reviews/category/categoryname

So I want to block the /reviews url bit as no one ever leaves reviews and it's not something I will be using in the future.

Also I have a dynamic navigation which creates urls that look like product-name.html?size=2&colour=14 these are also creating duplicate urls, anyway to fix this?

While I'm asking, anyone any tips for Magento?