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Thanks for your response Tom. Essentially there is only one query string variation that is live and linked to for the 10 pounds url. /10-pounds-products/     =>     /10-pounds-productss/?display=cost&value=10 The text content is identical on both URLs however the query results are obviously different. I don't think there is a way to remove the canonical tag aside from removing the plugin so I may have to go with changing it to the query string. Ideally I would like for users to see the non-query version in the SERPs and the click through to the the query version of the page. Not sure that's possible now though I will speak to the developer to see if this issue is avoidable. Thanks again Rosh

I think it depends on what the redesign consists in. For example a competitor of one of my clients has just redesigned their site but the difference is the old site had more relevancy to a specific keyword where as now the redesign is a general page that doesn't have as much relevancy to the specific keyword. The result was a drop in rankings. So if you're a simple site with little content or poor structure it's a good thing to redesign... if it's the other way around where you focus more on design and not on content (SEO) i think you will have a drop in rankings