Clematis Tangutica

This clematis is doing battle with the bindweed in the 'wild' area at the bottom of the garden. It will have to do battle for a bit longer, as I've got an assignment that's due in on Thursday of next week, and I can't get an extension to the deadline. Between now and next week, I won't have time to do any gardening as, before I can make a start on the assignment, there's the little matter of 4 weeks' worth of study to be done ...

Several people were able to tell me which variety of clematis it is, so I've changed the title. Many thanks!