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Hi there I want to say that it may have to do with your canonical tags. For instance... http://www.craftcompany.co.uk/pme-rose-leaf-veined-plunger.html has a canonical tag for http://www.craftcompany.co.uk/pme-rose-leaf-veined-plunger.html But, if you use http://craftcompany.co.uk/pme-rose-leaf-veined-plunger.html has a canonical tag for http://www.craftcompany.co.uk/pme-rose-leaf-veined-plunger.html?SID=1c501bb25ab64ab687f30b714dee9969 Your non www. URLs seem to have a SID parameter attached to their canonical tags. I would check out Google's resource on duplicate content. There are links to help you clean these up. I am not saying that's the reason, but I would definitely clean those URLs up in canonical tags. Hope this helps! Good luck!