When I go out each night (will be out just now as it is just about dark) on my way to the brassica plot to slaughter the slugs, I always see to the ones on the rhubarb leaves in passing as there are always quite a few. Last night there were very few at the cabbages etc., but my broad beans were under siege. I think I may have just about got the little blighters under control now. Some creature must be eating their halved carcases as there is no sign of them first thing in the morning.