Broccoli and cauliflower pests
Is there anyone who can help me identify and resolve the pests eating my broccoli and cauliflowers leaves. They are protected by fine gauge netting due to their proximity to mange tout so it cant be birds or small animals. There are no signs of slugs or snails.
Please see attached picture of the damage. thanks.
Please see attached picture of the damage. thanks.

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If just a tiny bit of leaf is touching the netting a butterfly will find it and lay eggs.
Every few days I check and trim back any leaves that touch the net, but sometimes I forget and the caterpillars appear. At least it's ususally only a few and I can pick them off.
If it's not caterpillars, then it's slugs/snails
Wisdom is not putting it in a fruit salad.
much appreciated!