Adult vine weevils are horrid pointy-headed beetles, a sort of dark browny-grey colour. They are very hard to kill, usually I wrap them up in a tissue and put them down the loo. They don't do the damage, apart from chewing the edges of leaves (distinctive little rectangular bites) but they lay the eggs which turn into the grubs. The grubs are disgusting, small and white with light brown heads. They hide in the compost, so you would only see them if you were actually looking for them. Nurseries will use a chemical to put in the compost when growing cyclamen etc to ensure that their stock doesn't get decimated by vine weevil, but I don't think it is available to "ordinary" people. In any case it's not a nice chemical. You can buy nematodes (parasite thingies) which will kill the grubs, but they are expensive and I'm not sure they work in the Winter. I have cyclamen in my window boxes, am just resigned to the fact that they will probably succumb at some point, and not only that, I'll have to renew all the compost.