Here are some more in our garden: -
Clematis "Marie Boisselot" (facing west)
Clematis Montana (facing south)
Clematis Montana (facing west)
We also have a C. Jackmanii but for some reason or another I don't seem to have a photo of it. This is very old and doesn't seem as vigourous as it used to be. I forgot to prune it back last year
The other one is, I think, Clematis Tage Lundell that Malcolm posted but it is a fairly new plant and not well established yet and at the moment the buds are tight shut and not particularly photographable.
Eric H