In this area we seem to be plagued with a red clover like weed with little yellow flowers which grows all over the garden and which can only be contained, not eradicated, with weedkiller - digging up is no use because if you leave the tiniest bit it grows again. I have a tinned fruit can which I have cut the top and bottom off which I place over the weed and spray into it , it makes a good guard so that the weedkiller does not go on to other plants. It might be a useful tip for anyone treating other pesky weeds.
Emma

PS If anyone knows what the weed is and has got rid of it I would be pleased to know.