I used to live in Cardiff, and can attest to the mess that exists there. The problem was not so great in the early nineties, but has definitely worsened - after a while I just quit going into the city centre even on a weekday evening. Now I live outside the UK, and despite my current locale having it's own problems, this kind of incident just doesn't happen; alcohol is marketed responsibly, and people drink (fairly) responsibly; in the three years I have been here, I never saw an ambulance crew dealing with a drunk. Perhaps all breweries / distillers should be paying some levy to the NHS to deal with the fall out they help generate. I hope your shifts pass without facing any trouble from overly merry drinkers.