..wavy edges.. recurving tepals at the tips... and it looks to be lighter in sun and when it opens out... you don't think it's one of yours do you Richard?... 'Carol Klein'??
Well, I hope you find out in due course, but I suppose unless you imported it then it will be a regular variety that we could all obtain, it must be one already out there commercially... even if new this season... do let us know if you find out eventually...
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see 3rd photo down... [sorry it's not your site]
http://www.taylorsclematis.co.uk/Carol-Klein.html