I tried and gave up....

ilet my ducks out on the plot they dont cause much damage at all certainly not as much as the chucks do and they enjoy themselves so much a bit of damage is exceptable to me for the comical things they get up to.

I use slug pellets on my plot, we aren't allowed livestock either, but I've got ducks at home, and this year I've had the best display of spring bulbs ever! I've had to put wire baskets over the top of the plants to stop them from being trampled, but once they're up you cant see them, and the ducks have done a fantastic job with the slugs and snails.

The idea of being totally organic is what most gardeners aspire to.  I'm always looking for ways to overcome pest problems without resorting to chemicals.  When I look back to what I and other gardeners were using 20 or 30 years ago, I don't worry too much about slug pellets, especially when they're organic and used as recommended. 

First choice if I remember (and have enough stashed) is a mixture of sharp grit and a whole load of old coffee grounds, especially for around lettuces and courgettes.  Read on here somewhere that it doesn't work. Hm.  Seems to work for me, or at least appeared to work last year (until I ran out and, er, got too lazy/forgetful) - let's just say I have an entire winter worth of old coffee grounds stored up ready for the plant out times!

Blue pellets of death when unavoidable, preferably in small piles rather than broadcast scattering - it is 'bait' after all - and the alien-style slime mats that result chucked into either the non-recycleable bin or the incinerator.