For some reason, the British refer to the type of thing that gets Lindsey Lohen into trouble every couple of months as "drink-driving." I'm assuming it's because the penalties for driving under the influence of alcohol (DUI), and driving while intoxicated (DWI) aren't distinguishable over there, so there's no need to make the assumption that the person behind the wheel was drunk. If that's not the case, then it must be one of those linguistic idiosyncracies, like dropping the definite article when referencing visits "to hospital."