In a previous garden we had lots of large dark slugs but eradicated them by going on "slug hunts", every morning and evening, especially when it had been raining and was warm. Numbers ran into hundreds but we won. Now we are inundated with little white ones in our new garden. Doing the same thing although tedious, numbers are on the decline. Someone told me once to collect them and put them in the compost bin to help break down the gardening waste. I have also heard of laying out large lettuce leaves at night , letting them congregate on them and then lifting them up in the morning but it didnt work for me! (but then I dont like lettuce lol) My main problems now are worms and couch grass!!! HEYHO, the Joys of gardening. Hope you get sorted soon. Regards