It's not plena elegans as I grow that (group 3) and it is only growing shoots at the moment. Given the flowering time (now) I suspect it's a montana cultivar or hybrid, maybe a double which hasn't fully opened yet?
A trowel in the hand is worth a thousand lost under a bush.
@Obelixx Yes, this comes from a garden in Brittany, West coast of France. @lilysilly I have suggested Broughton Star to the garden owner, waiting for his reply.
Broughton Star is a good shout. Funnily enough I had this in my Belgian garden and it grew like the clappers along a wire mesh fence but, just as the flower buds were forming, we had a -16C frost and the whole plant just died so I never saw the flowers and it never did a Lazarus like some of my other clems.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Posts
http://clematisontheweb.org/new-clemdetail.cfm?dbkey=580
You can search that site giving tepal colour and anther colour plus flowering time etc to help whittle down the options.