Indeed, even here in the Savoie we have had a bumper year for snails and slugs. Unfortunately Hugh Fearnley-Whittingstall has proven beyond reasonable doubt that it is not possible to render even the largest slugs edible.
Egg shells, coffee grounds, wood ash. They fart in their general direction, in my experience.
I have used the so-called "bio" pellets. I'm not 100% happy, but if you take into account the cost of bags of compost, plant trays, seed, water, and the man-hours in nuturing the seedlings, then it (almost) compensates for the not completely boi-neutral nature of the product, in my view. Ok, so I sold out. It's my garden and i'll cry if I want to.