That article makes a curious argument: that the UK won't have an oxycodone problem because they already have 2.5x more heroin users per capita than the US — so potential demand is already saturated. I mean, right, they probably won't have any more trouble from oxycodone than they already have from heroin and tramadol, but they already have a big opioid problem. (Maybe they're better at preventing overdose deaths than we are; I don't know.)