Millipede damage?

Just been down the allotment and found the Courgettes that I planted a few weeks ago, currently under a plastic-cloche affair, suffering from being nibbled somewhat. See picture, below.

Underneath the plantpots were around 20 millipedes, which I've since introduced to the sole-of-destruction.

Question - does the damage look millipede-related?, there's clearly something nibbling around the periphery of the leaves, but then there's the dirty great white "splodge" in the middle of one leaf with a sizeable hole in it.

Opinions?, are the Millipedes an innocent casualty?, am I looking at more than one problem here?

Going out on a bit of a limb here but I think millipedes tend to do more damage to underground roots and sometimes young seedlings, but are not a serious pest in the great scheme of things.

I think it is more likely your courgettes have been nibbled by slugs or snails (the "scraped" area on the leaf certainly looks like typical slug/snail damage to me.)