Hi Igor
Well, i am sorry i haven't dealt with this sooner. The board doesn't seem to be telling me when a post goes on (and as it's been pretty rare up to now, I haven't been checking for a while, sorry

Anyway. Composting weeds. Basically, compost anything that has no seeds or flowers on it. But don't compost the roots of perennial weeds like dandelion, bindweed, couch grass or thistles, because unless you are VERY good at building a compost heap, these will just grow through, and you will need to bin the lot.
Another way to deal with it is to cover the whole garden in carpet for a year and then when you lift it, there shouldnt be much left alive.
tiggsy