Oh well. There will be new leaves coming soon so keep an eye on them and see if they get eaten. Although it may be vine weevil. If you find any dark grey beetles these may be the culprits. Standard prevention is a nematode worm that kills the larvae, a bit pricey though. I'd wait and hope for the best.

could it be snails and slugs to volunteer as ive started to find some wakening from winter :o(