Posted: 04/06/2014 at 17:54
I have subsequently put down some slug pellets and next morning collected several small snails so maybe they were the culprits after all. I have not seen any caterpillars, slugs or snails actually on the plant but one little snail was attempting the long climb up the support!!!!!
Many thanks for all your comments I am afraid it is not worth taking a picture of my clematis as it is now in tatters!