Looks like a bit of leaf miner damage. You may be able to feel the little grub that is living between the top and bottom layers of the leaf … if you can you can squidge it between your finger and thumb … or just tear off that part of the leaf. The rest is fine to eat.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.