You have to hand it to the little blighters...they do amazingly efficient work. My 'Honesty' is turning to seed now and the lower leaves are full of these holes. I'm assuming that's the culprit creeping along the top edge of the leaf.
If it is he's had a very big meal for one so small
Agreed. There are a lot of snails and slugs around the Honesty which drop through from the wild garden next door. I had thought it might be one of those but wasn't prepared for the neat white edging around this hole. If anyone knows what caused this, would be interested to hear.