Just an update on this if anybody is interested. I've attached a screenshot form GWT and it shows a massive drop in URL errors. I have had some sitemap issues (in a separate thread), but even putting that to one side, I've seen a steady drop since hiding layered nav and sort by: from google. I feel pretty sure the remaining 135 url errors will drop off over the next couple of days.
What the benefits of this will be long term, I don't know, hopefully increased sales! But if nothing else it allows me to focus on genuine errors with out combing through thousands of layered nav URLS first.
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