Severe cabbage aphid infestation

All my brassicas are absolutely covered in cabbage aphid. Is there anything I can do or shall I just cut my losses and replant some autumn / winter stuff? I always read this pest can be tolerated as they don’t do that much damage but I beg to differ.  The plants do not look healthy at all. I’ve tried neem oil and it hasn’t worked. Below is a picture of a shoot I’ve just pulled off a cabbage. Absolutely gross. This is particularly bad to be fair but there are significant clusters of them on all of the plants.

Simon

I had this one year when I netted with debris netting & I see you have what looks to be enviromesh on yours? I think for me what happened was the pests could get in & not the predators, so then I’ve changed to butterfly netting, could be fluke but I’ve not had an issue since. I know that doesn’t help you for now, unless you buy some ladybirds & add in there to see them off & then maybe renet to allow ladybirds to leave once they’ve eaten the pests, hopefully you should have then boosted the ladybird population near you as well for future years. Just google what they’re larvae looks like so you don’t squish them.