Posted: 14/05/2014 at 15:01
Vigilance - go out in the evening with a torch and look underneath the pots and in the trays and ..................... there are as many ways of 'dealing' with them as there are gardeners!
As you've got the plants up and away from land-based wildlife like hedgehogs, you could get some of the safer slug pellets that are based on ferric phosphate http://www.organiccatalogue.com/p1821/ADVANCED-SLUG-KILLER-575g/product_info.html rather than the others that are so dangerous to wildlife. You only need to put a few pellets around your pots.
And look at other threads on here about slugs and snails - you'll soon pick up some tips.
Make sure there's nowhere for the slugs and snails to hide - check the rims of trays and under the pots - they're sneaky little critters