I can't tell what the blobs are on the top leaf in the picture... is the plant in a pot or in the ground and how long have you had it?

In a pot, it look like the stems have been stripped by something? x The blobs are something that has fallen on the leaf :o)

How long's it been in the same pot? Looks to me like its run out of root room...

And snails will strip the bark from Clematis too!

my first thought was snails stripping the stems. the leaf mottling lack of nutrients.

Thanks for your info friends xx

I think it's snails stripping the stems too. They get my Clematis Princess Diana every year but I now use slug pellets.

I put it in a pot last year & it did ever so well but now I think I will put it in the ground :o))
Plus it is getting full sun where it is & beeing they like their roots cool I think the plastic pot must be getting hot.
your info has really helped me Thank You xx

I moved mine from a big concrete pot in full sun to a north facing cool spot by the fence and it's thriving (apart from me having to be on constant snail/slug patrol).