I have resorted to the plastic tub rehoming method. I am pleased to report this is working VERY well. It may take a little more time but avoids poisoning anything (my cats, but also the snails and slugs themselves, I dont want my plants eating but I am loathe to kill, and even more so to kill by poison)this has been the most sucessful method so far. I will have to carry out periodical removals as there is still the occasional little 'un, and the slugs will continue to arrive from neighbouring yards, and this method will probably be little use to those with a real garden, but has worked in my little containered yard.Although rather scarily I must point out I have removed around 500 snails and slugs (so far!)in a period of 1 month, from my yard which has a floor area of less than 20 square meters (and thats squared meters not a 20m sided square!)