Prof Pilling, who worked on the guidance suggesting classes for parents of children with conduct disorders, said treating the disorder would save money that would otherwise be spent in the criminal justice system.
By any standard that Nice operates, these treatments are clearly cost effective.
If you put in criminal justice costs, these interventions are dominant. It's actually cheaper to provide them than not to provide them, they're saving money.
The cost of not treating a 10-year-old with a conduct disorder for the next eight years, over the rest of their childhood, are in the £80,000 to £100,000 range.
More top news
Britain's broken social care system is leaving pensioners to provide free care for disabled loved ones.
More than 70 firefighters were called to the blaze in the early hours of Friday morning.
UK consumers are willing to pay for more environmentally friendly packaging, but many remain confused as to which items can be recycled.