Great thread here, heres a few tips for slugs,
Collect toads & let them out in your garden, they eat more slugs than anything else for the simple reason there active when the slugs are out ( at night time ) Toads are your freinds look after them. A small garden pond could get you a few hundred of these for nothing. Keep your seedbeds as clod free as possible. Slugs will crawl under clods & in the cracks of your flower bed, so try to make it hard for them, leave a fine tilth or seedbed. Clear away all your garden junk, flower pots, ceramics etc leave them no hiding place. Please take care when using slug pellets, they can contain formaldehyde, or metaldehyde, and the pellet can be made of pasta flour, so birds will eat them. there are more environmental alturnatives, but may not be as good. Place pellets under an old roof tile, plastic sack, etc so birds can not get to them. Any dead slugs you find, please pick up & put in the bin, again birds will pick them up & take to their nest, poisoning the next generation of slug predators. Deter Magpies & squirells from your garden, these eat an enormous ammount of song birds eggs, they also kill young birds. The more bird nests you have in your garden the more mouths they have to feed the less slugs you get. Thrushes eat alot of snails, look after them, they suffer more than most birds at the hands of magpies, the reason is they nest at the top of the hedge, tree, wall, There nests are the first to beseen by flying magpies, usually early in the year when there is less cover.They will reward you by singing beautifully in the evening while you tend your plants, and can eat 20 - 30 snails a day. Nest boxes. Kill every slug you see, 1 slug = 25000 slug eggs. You get the message, I dont like slugs,I like song birds.