Just a thought. We go to a lot of trouble to cover Brassica type things against the Beetle but I have never, to my knowledge, had an attack on other than Radish, Chinese Veg, Rocket etc.
Are we being too fussy & going for an unnecessarily expensive material - where netting ( fine enough to avoid catching birds?) would ward off C/Whites, Cats, Rabbits, Foxes & Pigeons??