I'd sent two emails to Nokian within minutes of each other. One was through the Nokian website, where I couldn't send photos. The second was a copy and paste job via an email address I found on the site. The second emails had some photo's attached. I think the first fob off response (see above post) came from the website link email. However, low and behold, I got a further email. I think this is in response to the photo email. Might be the UK Nokian distributor, not 100% on that though. They've asked me to complete the attached claim form so they can 'process the percentage claim for you'.
So, If you've got a set of Nokians. Keep any invoice/receipt. You never know. From what I've read online, seems a few folk have been reimbursed to the value of the tread left on their tyres, in light of this issue.
Worth having a read of the T and C's that
@mmi has kindly linked above. Note the relevance of '5 years' and the no mention of any warranty not being transferable.