Never heard of 'Creeping Charlie.' But if it is a broad leaf weed then any of the weed killers for lawns would probably work.

Now found it is what we call Ground Ivy, Glechoma hederacea.

Beat me to is by a whisker Owdboggy! i hadn't heard of it either. We live and learn. Ordinary weed and feed or weedol should do the trick. Strange we have lots of it down by one of the compost bins but its never tried to get into the adjacent lawn. Fingers crossed.