What's eating my red currents?

[Tadpole123]

Well they are still green at present but having checked them today, about 80% of the berries are gone.
I love recurrents.
It's not birds, the netting is still intact, and had a look over and except for a few greenfly I cant find anything on it. Other than that is looks fine and healthy.

Any ideas? never had this happen before.