I have had an ongoing problem with the little sods for about 4 years now. I have used Provoas Weevil Killer but I think they are starting to like it and can't wait for their next fix. 
Has anybody found a good way of getting rid of them other than new compost or destroying the grubs by hand, or finding them with a torch late at night. Any horticulurists out there?
The main room in your house...


