Tiggs, slugs live in the soil , they quite happily burrow through it, that is how they can munch your spuds in the ground. A compost bin will not hold them unless it is an air-tight one, and as pointed out by others they would just breed like billy-o in there.

I found a six inch long bright orange monstrosity oozing its way along the middle of the road on Saturday and my walk was punctuated by a crunching sound as I strode along in the dark, snails out mating in the rain. They will be resurgent now it has rained.

Check this http://www.nomoreslugs.com/about/species.php out you may find it helpful.

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