Will my Cabbage, brocoli & sprouts ravaged by caterpillers re-grow

I suppose it depends on whether the growing tips were munched...you might get some growth, but whether there's enough to make a meal is doubtful.

If you sprayed them with insecticide, I wouldn't eat them anyway!

hi there, the same happened to my brocolli. i just cut off the leaves that were affected and fed them, and waited. There is a great spray called "bug clear" that you can get from wilkos and you can spray and eat the same day. My tomatoes were infested, but one spray gets rid of them. try it! give them a bit of time and they will be fine i think, unless as previous poster said the growing tips are gone.