It depends on what you want from this break crop as to what you are willing to spend on herbicides. A few charlock don’t look to bad, or do they? What happens when they grow out the top of the crop or when harvest is delayed and the weather turns “a bit damp?”
Control of charlock can be achieved as these photo’s show. First the chemical bleaches out the chlorophyll and eventually the plant dries out and disappears into the base of the crop. However, as the last photo illustrates there is always some crop damage so you need to be prepared for this as well.