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
The singer best known as Johnny Rotten offered advice for Britain's Brexit negotiators as he told ITV News his biggest hit is misunderstood.
The Atlantic regains control of our weather
Bosnian Kerim Ahmetspahic smashed the concrete blocks in just 35 seconds, achieving a Guinness World Record in the process.