I have read a post by someone on another site
they said, when I pm'd them, that the use of bran, bought from a chicken feed place, placed around thier veg at 1" deep and 6" round has kept the critters at bay. it is ok in the rain and lasts a couple of months. a big bag for a tenner lasts all season. having read an article on slug pellets poisoning the water table and one pellet tainting 1100 two gallon cans of water to unacceptable levels
I will be trying bran. I do not use pellets anyway as we are on fairly light soil and the dry weather has kept the slimeys away, but, the first rain and hoards of the hungry slimeballs are waiting in the wings. ready to come a munching.
anyway worth a try as the person I spoke to swears by it.
good luck.