Pesky caterpillars

in Fruit & veg
As much as i love butterflies, the caterpillars have eaten their way through a months supply of brocolli leaves which I was hoping to get a crop from next year, is it to late to salvage & just let them finish what they started?

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I've just picked 6 small, light-green, buggers from my radishes. Unfortunately, they'd had a very good feed before I got to them. Nicely camouflaged as well - the sneaky, wee bams!