Hawthrone's nursery holds a national collection of clematis viticella. I suggest you contact Richard Hodson there and ask if he can help you locate one.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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for the fag ends of the aristocracy.
The clematis was raised by Brian Collingwood. Here is a link to the Facebook page he posts on so maybe you can ask him.
https://m.facebook.com/InternationalClematisSociety/posts/3509429792428397