What's causing this damage on my violas? It's very distinctive.

[Greensleeves]

Not the usual slug and snail decimation (though we have plenty of those fuckers as well!) and no sign of aphids anywhere near the violas! Could it be spider mites? I can't see any webs. Do I need to rip these plants out and get rid of them? All the flowers have been ruined, even the ones that are still buds have been chewed out

Bugger, I forgot the photos

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Looks fungal to me.

please try changing compost

Hmm, looks like suggesting a better viola case isn't going to cut it.

Haha, that was my first thought too

Sorry OP, no advice but I hope your lovely violas recover.