Welcome sharky. You must have missed the flowers. Your pic shows the fluffy seeds. http://www.google.co.uk/search?q=cl...&source=og&sa=N&hl=en&tab=wi&biw=1268&bih=529
Thankyou Tyrlych and Silver Surfer, I wouldnt have guest they were seed heads, they are so nice they should be a flower in their own right. (nice one)
Flowercity, without a pic showing the flowers, it is impossible to say which Clematis it might be. There are many different Clematis that produce these beautiful seed heads.