I've worked in a few help centres in my time and I know that depriving people of their coping mechanism, which self-hamr can be interpretted as, by making them go cold turkey often does do more harm than good.
What the NHS now needs to address is why self harm is on the rise and start making parents, guardians and kids more aware of it so all the misconceptions can be chucked out of the window.
I'm amazed that nothing's been done before now. After all there used to be kids in Ganges who self harmed because they couldn't cope: swallowing toxic substances like cleaning fluid, open safety pins, cutting themselves with razor blades. Did the andrew take any notice? Well it did if they ran away: it harmed them by giving them the dreaded cuts. Perhaps it should have tried finding out WHY they went on the Run in the first place? Well done NHS!