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Thanks for this. The /item-details/ are linked to from the Auction pages (e.g: https://www.wilkinsons-auctioneers.co.uk/auction-items/?id=13)
We've looked into the canonical issue and sorted that out, so fingers crossed on that being the issue. I'm only really familiar with canonical being a pain with ecommerce sites, but I know to keep an eye on it for others sites we have using parameters/custom pages.
Recently rebuilt a site for an auctioneers, however it has a problem in that none of the lots and auctions are being indexed by Google on the new site, only the pages like About, FAQ, home, contact.
Checking WMT shows that Google has crawled all the pages, and I've done a "Fetch as Google" on them and it loads up fine, so there's no crawling issues that is standing out. I've set the "URL Parameters" to no effect too. Also built a sitemap with all the lots in, pushed to Google which then crawled them all (massive spike in Crawl rate for a couple days), and still just indexing a handful of pages.
Any clues to look into would be greatly appreciated.